Answer:
0.0144 moles
Explanation:
To calculate the number of moles of gas in a volume of 4.5 liters, we use the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we need to convert the temperature to Kelvin:
37°C = 37 + 273.15 = 310.15 K
Next, we can plug in the known values into the ideal gas law and solve for n:
PV = nRT
(1.00 atm)(4.5 L) = (n)(0.0821 Latm/mol K)(310.15 K)
n = (1.00 atm)(4.5 L) / [(0.0821 Latm/mol K)(310.15 K)] = 0.0144 moles
So, it would take approximately 0.0144 moles of gas to fill an average man's lungs.
ALLLEN
Answer:
0.124 moles
Explanation:
PV = nRT, can be used, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
Converting the volume to liters and temperature to Kelvin:
V = 45 L
T = 37°C + 273.15 = 310.15 K
Plugging these values into the ideal gas law:
1.00 atm * 45 L = n * 0.0821 Latm/mol/K * 310.15 K
Solving for n:
n = (1.00 atm * 45 L) / (0.0821 Latm/mol/K * 310.15 K) = 0.124 mol
So, it would take about 0.124 moles of gas to fill an average man's lungs.
Compound A + Compound B —> Compound C + Compound D
———
Identify the reaction type
The type of reaction shown is a double displacement reaction.
Types of reactionThe given chemical equation represents a chemical reaction known as a double displacement or metathesis reaction.
In this type of reaction, the cations and anions of two different compounds switch places, resulting in the formation of two new compounds.
In the given equation, Compound A and Compound B react to form Compound C and Compound D by exchanging their respective cations and anions.
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Balance the following reaction.
Cu + Ag(NO3) --> Cu(NO3)2 + Ag
If you are given 2.5 grams of copper and 5 g of silver nitrate
What is the Limiting Reactant? __________ (Cu/AgNO3)
How much of each product do you produce?
_________ g Cu(NO3)2
_________ g Ag
Answer:
The balanced chemical equation for this reaction is:
2 Cu + Ag(NO3)2 -> 2 Cu(NO3)2 + Ag
The limiting reactant is the reactant that runs out first and determines the amount of product that can be produced. To determine the limiting reactant, we need to calculate the number of moles of each reactant.
From the given mass of copper, we can calculate the number of moles as follows:
2.5 g Cu / 63.55 g/mol = 0.0395 mol Cu
From the given mass of silver nitrate, we can calculate the number of moles as follows:
5 g AgNO3 / 169.87 g/mol = 0.0295 mol AgNO3
Since 0.0295 mol of AgNO3 is less than 0.0395 mol of Cu, AgNO3 is the limiting reactant.
To calculate the amount of each product produced, we can use the stoichiometry of the balanced equation.
For Ag, the reaction produces 1 mole of Ag for every 2 moles of AgNO3, so we have:
0.0295 mol AgNO3 * 1 mole Ag / 2 moles AgNO3 = 0.0148 mol Ag
And converting moles to grams:
0.0148 mol Ag * 107.87 g/mol = 1.59 g Ag
For Cu(NO3)2, the reaction produces 2 moles of Cu(NO3)2 for every 2 moles of AgNO3, so we have:
0.0295 mol AgNO3 * 2 moles Cu(NO3)2 / 2 moles AgNO3 = 0.0295 mol Cu(NO3)2
And converting moles to grams:
0.0295 mol Cu(NO3)2 * 164.46 g/mol = 4.86 g Cu(NO3)2
Therefore, the limiting reactant is AgNO3 (Cu/AgNO3) and the reaction produces 1.59 g of Ag and 4.86 g of Cu(NO3)2.
4. A mass of 2.50 grams of blue, hydrated copper II sulfate is placed in a container and heated to remove all of the water. After heating 1.59 grams of white, anhydrous copper II sulfate remains. What is the formula and name of the original hydrate?
The formula of the original hydrate is CuSO4 · 5H2O, and its name is copper (II) sulfate pentahydrate.
How to find the formula and name of the original hydrateFirst we need to use the mass information provided in the problem and the molar masses of the relevant compounds.
First, we can calculate the mass of water that was present in the original hydrate:
Mass of water = Mass of hydrate - Mass of anhydrous salt
Mass of water = 2.50 g - 1.59 g
Mass of water = 0.91 g
Next, we can calculate the number of moles of anhydrous copper (II) sulfate that remained after heating:
Number of moles of anhydrous salt = Mass of anhydrous salt / Molar mass of anhydrous salt
Molar mass of anhydrous copper (II) sulfate = (1 x 63.55 g/mol) + (1 x 32.06 g/mol) + (4 x 16.00 g/mol) = 159.61 g/mol
Number of moles of anhydrous salt = 1.59 g / 159.61 g/mol
Number of moles of anhydrous salt = 0.00997 mol
We can then calculate the number of moles of copper (II) sulfate that were present in the original hydrate:
Number of moles of copper (II) sulfate = Number of moles of anhydrous salt
Number of moles of copper (II) sulfate = 0.00997 mol
Finally, we can use the mass of copper (II) sulfate and the number of moles of copper (II) sulfate to determine the formula and name of the original hydrate. The formula of the hydrate will be in the form of CuSO4 · xH2O, where x is the number of water molecules per formula unit.
The molar mass of CuSO4 is (1 x 63.55 g/mol) + (1 x 32.06 g/mol) + (4 x 16.00 g/mol) = 159.61 g/mol.
The mass of CuSO4 in the original hydrate is 2.50 g - 0.91 g = 1.59 g.
The number of moles of CuSO4 in the original hydrate is therefore 1.59 g / 159.61 g/mol = 0.00997 mol.
The ratio of moles of water to moles of CuSO4 in the original hydrate is:
x = (moles of water) / (moles of CuSO4)
x = (0.91 g / 18.02 g/mol) / 0.00997 mol
x = 5.06
Therefore, the formula of the original hydrate is CuSO4 · 5H2O, and its name is copper (II) sulfate pentahydrate.
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Predict the missing component in the nuclear equation.
The missing nucleus in the equation is 234/90 Th
What is a nuclear reaction?A nuclear reaction is a procedure wherein an atom's nucleus is altered by being divided or fused with the nucleus of another atom. We know that the masses and the charges that we have in the nuclear reaction must be balanced according to what have been shown in the image that is attached here.
We can then see that the nuclear reaction that is shown in the image is an alpha decay and there is the loss of the helium atom from the system as has been typified in the equation.
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Tutored Practice Problem 4.5.1COUNTS TOWARDS GRADE
Calculate solution concentration in molarity units.
A student weighs out 5.96 g of Zn(CH3COO)2, transfers it to a 250. mL volumetric flask, adds enough water to dissolve the solid and then adds water to the 250 mL mark on the neck of the flask.
Calculate the concentration (in molarity units) of zinc acetate in the resulting solution?
M=?
The number of moles of 5.96 g of zinc acetate is 00324 . The volume of the solution is 0.25 L. Then the molarity of the solution is 0.16 M.
What is molarity ?Molarity of a solution is a common term used to express the concentration of a solution. It is the the ratio of number of moles of the solute to the volume of solution in liters.
Given that the solution contains 5.965 g of ammonia.
molar mass of zinc acetate = 183.4 g/mol.
no.of moles in 75 g = 75/17 = 4.411 moles.
volume of solution = 250 ml = 0.25 L.
molarity = no.of moles of solute/volume of solution in L.
= 0.032 mole/ 0.25 L= 0.16 M.
Therefore, the molarity of the solution is 0.16 M.
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Which of the following is an example of an Arrhenius acid?
A. BF3
B. NaOH
C. HI
D.NH3
Answer:
C. Hl
Explanation:
I just looked it up on the internet lol
Calculate the volume of air in liters that you might inhale (and exhale) in 24.0 hours. Assume that each breath has a volume of 0.495 liters, and that you are breathing 13 times a minute.
The units which are used to represent the volume are mL, L, cm³, m³, etc. The volume of air in liters that you might inhale (and exhale) in 24.0 hours is 10,684.8 L.
What is volume?The measure of the capacity that an object holds is generally defined as the volume. For example if a beaker can hold 100 mL of water, then its volume is said to be 100mL.
Here in minute, volume is:
15 × 0.495 = 7.42 L
In an hour, volume is:
7.42 × 60 = 445.2
In 24 hours, the volume will be:
Volume = 445.2 × 24 = 10,684.8 L
Thus the volume of air in 24 hours is 10,684.8 L.
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Dr. MArcus analyzed items on his physics test by calculating the proportion of students who got each item correct. Dr. Marcus was examining -item difficulty
-the guessing threshold
-item discriminability
-the antimode Ch6
Choose matching definition
a. item discriminability
b. mental age
c. item discrimination
d. item difficulty
Item analysis involves analyzing the performance of test items by calculating statistics such as item difficulty, item discriminability, and item discrimination. This information can be used to improve the test items, identify flawed items, and evaluate the overall quality of the test.
a. item discriminability - This refers to the ability of an item on a test to discriminate between students who have high levels of knowledge or skill in the domain being tested and those who do not.
b. mental age - This is a measure of intellectual ability that compares a person's performance on an intelligence test with the performance of typical individuals at different ages.
c. item discrimination - This is another term for item discriminability, which refers to the ability of an item on a test to discriminate between high- and low-performing students.
d. item difficulty - This refers to the level of challenge posed by an item on a test, typically measured as the proportion of students who answer the item correctly.
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--The complete question is, Dr. Marcus analyzed items on his physics test by calculating the proportion of students who got each item correct. Dr. Marcus was examining,
a. item discriminability
b. mental age
c. item discrimination
d. item difficulty--
For each of the following, determine the type of reaction. (combination or synthesis, decomposition, double replacement, single replacement, or combustion)
1. 2 Na + Cl2 2 NaCl type:
2. FeCl2 Fe + Cl2 type:
3. C2H4 + 3 O2 2 CO2 + 2H2O type:
4. F2 + 2 NaBr 2 NaF + Br2 type:
The given equations are of the following type:
1. 2 Na + Cl2 = 2NaCl : Combination reaction
2. FeCl2 = Fe + Cl2 : Decomposition reaction
3. C2H4 + 3 O2 = 2CO2 + 2H2O : Combustion reaction
4. F2 + 2 NaBr = 2NaF + Br2 : Single displacement reaction
Combination reaction: Reaction in which two or more elements or compounds join to form a single compound is called a combination reaction.
Decomposition reaction : Reaction in which one reactant breaks own into two or more products is called a decomposition reaction.
Combustion reaction : Reaction in which a compound and an oxidant is reacted to produce a new product along with heat and light is called a combustion reaction.
Single displacement reaction : Reaction in which one element is replaced by another in a compound during the reaction is called a single displacement reaction
Double displacement reaction: Reaction in which two reactants exchange ions to form two new compounds double displacement reaction.
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Build the molecular models of the compounds listed below and draw the Fischer projection for each of them. In the Fischer projection when the compound has more than one stereogenic center the longest carbon chain is drawn from top to bottom (vertical), with the functional group carbon at the top (top). Identify the pairs of molecules that represent enantiomers and diastereomers and identify each stereogenic center by writing R or S next to it.
The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.
Enantiomers are pairs of molecules that are non-superimposable mirror images of each other. Enantiomers have the same chemical and physical properties, except for their interaction with polarized light. Enantiomers have opposite configurations at every stereogenic center, so they have opposite R or S designations.
Diastereomers, on the other hand, are stereoisomers that are not mirror images of each other. Diastereomers have different physical and chemical properties, and they have different configurations at one or more stereogenic centers. Unlike enantiomers, diastereomers do not have opposite R or S designations.
To identify stereogenic centers in a molecule, one needs to determine the number of different substituents attached to a carbon atom. The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.
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Table C: Known Specific Heat Values for Common Materials
Material
Specific Heat
(J/g C)
4.18
Water
Concrete
Wood
Aluminum
Glass
Sand
Steel
Iron
Copper
Lead
Gold
0.88
1.80
0.90
0.84
0.83
0.49
0.44
0.38
0.16
0.13
% Error
(deviation from known)
Water is the best insulator because it has the greatest specific heat capacity and all other substances have low specific heat than the water.
What do you mean by the specific heat capacity?The term specific heat capacity is defined as the amount of heat in joules required to increase the temperature of one gram of a substance by one degree Celsius.
An insulator is a substance which conducts heat to a very miserable extent.
From the definition of specific heat capacity and insulator, we conclude that the higher the value of specific heat capacity, the harder it would be to heat up the material, that is, the more heat would be needed.
All the given substances, only water has the greatest specific heat capacity, therefore, it's the best insulator.
Gold is the best conductor, as it has the lowest specific heat capacity.
Thus, the best insulator is water.
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Your question is incomplete, most probably your question was
Table C: Known Specific Heat Values for Common
Materials
Material Specific Heat (J/g*C)
Water 4.18
Concrete 0.88
Wood 1.80
Aluminum 0.90
Glass 0.84
Sand 0.83
Steel 0.49
Iron 0.44
Copper 0.38
Lead 0.16
Gold 0.13
What is the best insulator and why?
If the density of tin is 7.26 g/cm^3, what is the thickness of a piece of tin foil that measures 5.00 cm by 5.00 cm and has a mass of 2.722 g
Density and mass concentration have the same numerical value for a pure substance. Density can be important to packaging, purity, and buoyancy because different materials typically have varied densities.
What is density?
At normal temperatures and pressures, osmium and iridium are the densest elements that are currently known.
The dimensionless number "relative density" or "specific gravity," which is the ratio of the material's density to that of a standard material, typically water, is occasionally used to substitute density in order to make density comparisons across different systems of units simpler.
As a result, if a substance has a relative density lower than one in comparison to water, it floats.
We know that
Density = mass / volume
And volume = L*W*H (thickness)
First calculate the volume of foil as follows:
Density = mass / volume
Volume = mass / density
= 2.722 g/ 7.26 g/ cm^3
= 0.375 cm^3
And volume = = L*W*H (thickness)
0.375 cm^3 = 5cm*5 cm * thickness
Thickness = 0.015 cm
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what mass in grams, of liquid is in 34.6ML of liquid
Answer: 30.3 g
I had this question..If i hadn't done this I'd be confused.
Calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. What mass of each substance is present after 25.24 g of calcium nitrate and 26.30 g of ammonium fluoride react completely?
___ g Calcium nitrate
___ g Ammonium fluoride
___ g Calcium fluoride
___ g Dinitrogen monoxide
___ g Water
Identify the base in the following neutralization reaction:
(Use this key to select your answer: Reactant 1+ Reactant 2 → Product 1 + Product 2):
Mg(OH)2(aq) + HNO3(aq) → Mg(NO3)2 + H₂O
Product 1
Reactant 2
Reactant 1
Product 2
Answer: c – Reactant 1
Explanation:
Since HNO3, (Nitric Acid), is an acid, that leaves Mg(OH)2 to be the Base in the reaction.
Hence the answer is Reactant 1
Answer:
it's c
Explanation:
maybe...I don't know how I works it out but it is c
Please help me I’ve been stuck on this question for 10 minutes
The arrow shows that the bond between the chlorine atom and the fluorine atom is polar covalent. The electrons in the bond are pulled closer to the fluorine atom, and the chlorine atom is slightly negative.
What is a polar covalent atom?A polar covalent bond is a type of chemical bond that occurs when two atoms share electrons unequally. In a polar covalent bond, the electrons are attracted more strongly to one of the atoms than the other, leading to a separation of electric charge.
The electrons in the bond are pulled closer to the fluorine atom, making it slightly negative, and the chlorine atom becomes slightly positive. This is because fluorine is more electronegative than chlorine, meaning that it has a greater attraction for the shared electrons in the bond.
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Iodine-131 has a half-life of 8 days. How many days will it take before 32mg of Iodine-131 has decayed to 1mg?
Answer:40 days
- K = [ ln ( 1/2 ) ] / [ t 1/2 ]
- K = [ln ( 1/2 ) ] / 8 = - 0.08664 ( days )^-1
ln C/ C0 = ( - K ) ( t )
C=1mg and C0= 32mg
t = [ ln (1/32 )] / [ - 0.08664 ] = 40 days
Can you help me solve number 40?
Answer:
A) 21 - 6 carbon, 7 oxygen, and 8 hydrogen
B) 12 - 6 hydrogen, 3 carbon, and 3 oxygen
Explanation:
Also, here is #39 :)
A) 56 - 36 Hydrogen, 18 Carbon, and 2 Oxygen
B) 167 - 104 Hydrogen, 57 Carbon, and 6 Oxygen
What effect does a drop in pH during high-intensity interval exercise have on glycogen utilization?
Answer:
During high-intensity interval training, a pH decrease may affect how well glycogen is used. Acidosis, often known as a drop in pH, is a condition that develops when lactic acid builds up in the muscles. The glycogen phosphorylase enzyme, which converts glycogen to glucose, may become inhibited as a result of this acidosis. As a result, glycogen is used less frequently as a source of energy. As a result of this decline in glycogen usage, tiredness and poor performance during intense activity may result. However, the impact of acidosis on glycogen use is poorly understood, and more investigation is needed to identify the underlying mechanism.
Hope it helps! : )Explanation:
Answer:
During high-intensity interval exercise, a drop in pH can affect glycogen utilization in several ways. A decrease in pH, also known as acidosis, can lead to a decrease in the activity of enzymes involved in glycogen metabolism. For example, glycolytic enzymes, which break down glycogen into glucose and other metabolites, are sensitive to changes in pH and their activity may be decreased in acidic conditions.
In addition, acidosis can also reduce the availability of glycogen in muscle cells, as it can cause the breakdown of glycogen into lactate, which can interfere with the normal functioning of the muscle. This, in turn, can lead to decreased energy production and a reduction in the ability of the muscles to perform high-intensity activities.
Explanation:
Therefore, a drop in pH during high-intensity interval exercise can have a negative impact on glycogen utilization, leading to decreased energy production and reduced athletic performance.
Santiago works in tech support, and a customer has called him to get some help with a file that they are having trouble opening. Santiago asks them, “What is the file extension?” They reply, “How do I figure that out?” Which of these statements is the best response?
Group of answer choices
“Look at the size of the file.”
“Look at the first word of the file name.”
“Look at the letters that follow the dot after the file name.”
“Look at the letters before the dot before the file name.”
The best response to the customer's question, "How do I figure out the file extension?" is:
"Look at the letters that follow the dot after the file name."
What is Customer?
A customer is a person or organization that buys or uses goods or services produced by another person or organization. Customers are an essential part of any business or economy, as they create demand for products and services, which in turn drives economic activity.
Customers may be individuals, such as consumers who buy products for personal use, or businesses, which buy products for use in their operations or to sell to their own customers. Customers may also be government agencies, non-profit organizations, or other institutions.
The file extension is typically the letters that follow the last dot in the file name. For example, if the file name is "document.pdf", the file extension is ".pdf". The file extension is used to indicate the type of file and the software that should be used to open it. Knowing the file extension is important because it helps in troubleshooting issues with opening files, as different file types may require different software to open them.
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Three 1.0 liter flasks were filled with H2, O2 and Ne, respectively, at STP. Which of the following statements is correct?A. Each flask has the same number of gas moleculesB. The velocity (molecular velocity) of the gas molecules is the same in each flask.C. The density of each gas is the sameD. The number of O2 and H2 molecules is twice as large as Ne atoms.e. None of the above is true.
Three 1.0 liter flasks were filled with H2, O2 and Ne, respectively, at STP, the statement true is Each flask has the same number of gas molecules.
STP, or standard temperature and pressure, refers to the nominal atmospheric conditions at sea level. The temperatures and pressures are 0 degrees Celsius and 1 atmosphere, respectively. In addition to other professionals, the STP value is crucial for physicists, chemists, engineers, pilots, and navigators.
STP is frequently used to set standard temperature and pressure conditions, which is crucial for measurements and recording of physical and chemical processes.
It's inversely as important to indicate the applicable reference conditions of temperature and pressure when stating the molar volume of a gas( 41) as it's when expressing a gas volume or volumetric inflow rate. Stating the molar volume of a gas without indicating the reference conditions of temperature and pressure has veritably little meaning and can beget confusion.
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Use the rate law to quantitatively explain what would happen in the following situations?
a. what would happen to the rate of the reaction if the iodide concentration was doubled?
b. what would happen to the rate of the reaction if the thiosulfate concentration was doubled?
c. what would happen to the rate of the reaction if the persulfate concentration was halved?
d. how would increasing the total volume of the solution affect the actual rate of the iodine clock reaction
A.By using the rate law it was discovered that doubling the concentration of Fe(III) doubled the reaction rate, and doubling the concentration of iodide quadrupled the reaction rate.
What is rate law ?A chemical reaction's rate law is the mathematical relationship between the rate of the reaction and the concentrations of the reactants. The rate law of a chemical reaction is determined by measuring the initial rate of the reaction at various reactant concentrations.
B.Simply changing the concentration of thiosulfate in solution allows us to see how the rate of reaction changes, If the thiosulfate ion concentration is doubled while the rate of reaction remains constant, the reaction is zeroth order in thiosulfate ion concentration.
C. Nothing happen to the rate of the reaction if the per sulfate concentration was halved.
D.The concentrations of all reactants are held constant. The total volume of the solution has no effect on the rate of the iodine clock reaction.
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Water is constantly diffusing into the cytosol of freshwater single-celled organisms. In order to maintain the proper solute concentrations in the cytosol, contractile vacuoles pump out the excess water. An experimenter placed single-celled organisms into various saline concentrations and recorded the ATP used by the contractile vacuole. The data are shown in the graph. Of the following, which additional investigation can be used to determine when the cells are in an isotonic solutionA. Decreasing the salinity of the environment a little at a time until the ATP usage reaches a maximum
B. Decreasing the salinity of the environment a little at a time until ATP usage reaches a minimum
C. Increasing the salinity of the environment a little at a time until ATP usage reaches a maximum
D. Increasing the salinity of the environment a little at a time until the ATP usage reaches a minimum
To determine when the cells are in an isotonic solution, the additional investigation that can be used is option B. Decreasing the salinity of the environment a little at a time until ATP usage reaches a minimum.
An isotonic solution is one where the solute concentration outside the cell is the same as the solute concentration inside the cell. In this state, there is no net movement of water into or out of the cell, and the contractile vacuole does not need to pump out excess water. As the salinity of the environment is decreased, the solute concentration outside the cell will decrease, and water will enter the cell, leading to an increase in the workload of the contractile vacuole. However, when the salinity of the environment is decreased to the point where it becomes isotonic with the cytosol of the cell, the workload of the contractile vacuole will reach a minimum, as there is no more excess water to be pumped out.
Therefore, by decreasing the salinity of the environment a little at a time until the ATP usage reaches a minimum, the experimenter can determine when the cells are in an isotonic solution.
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Methanol can be produced through the reaction of CO and H2 in the presence of a catalyst.
CO(g) + 2H2(g) catalyst, CH;OH(0)
If 85 g of CO reacts to produce 61.8 g of
CH;OH, what is the percent yield of CH OH?
Answer in units of%.
Answer:
63.6%
Explanation:
To calculate the percent yield of CH3OH, we need to compare the actual yield to the theoretical yield, which is the maximum amount of CH3OH that can be produced based on the amount of CO and H2 that was used in the reaction.
The theoretical yield can be calculated using the balanced chemical equation for the reaction:
CO(g) + 2H2(g) -> CH3OH(l)
Since 1 mole of CO reacts with 2 moles of H2 to produce 1 mole of CH3OH, the moles of CH3OH produced can be calculated by dividing the mass of CO by its molar mass and then multiplying by the ratio of CH3OH to CO in the balanced equation (1 mole of CH3OH per 1 mole of CO).
Let's assume the moles of CO used in the reaction is n. Then,
n = 85 g CO / 28.01 g/mol = 3.03 moles
And the theoretical yield of CH3OH would be:
3.03 moles CO * (1 mole CH3OH/1 mole CO) = 3.03 moles CH3OH
The moles of CH3OH can then be converted to grams:
3.03 moles CH3OH * 32.04 g/mol = 97.36 g CH3OH
Finally, the percent yield can be calculated by dividing the actual yield of CH3OH (61.8 g) by the theoretical yield (97.36 g) and multiplying by 100%.
Percent yield = (Actual yield / Theoretical yield) * 100%
= (61.8 g CH3OH / 97.36 g CH3OH) * 100%
= 63.6%
So the percent yield of CH3OH is 63.6%.
tell me if you confus
ALLEN
An atom has 15 electrons. Find
i. Number of subshells
ii. Number of orbitals
iii. Number of electrons having azimuthal quantum number = 1
Answer:
Given that an atom has 15 electrons, here's the solution to each part of the problem:
i. Number of subshells:
The number of subshells can be determined by the electron configuration of the atom. The electron configuration of a neutral atom with 15 electrons is 1s2, 2s2, 2p6, 3s2. Thus, there are 4 subshells: 1s, 2s, 2p, and 3s.
ii. Number of orbitals:
The number of orbitals in each subshell can be determined by the value of the principal quantum number (n) and the angular momentum quantum number (l). The number of orbitals in a subshell is equal to 2l + 1.
For the subshell 1s, l = 0, so there is 1 orbital (2 * 0 + 1 = 1).
For the subshell 2s, l = 0, so there is 1 orbital (2 * 0 + 1 = 1).
For the subshell 2p, l = 1, so there are 3 orbitals (2 * 1 + 1 = 3).
For the subshell 3s, l = 0, so there is 1 orbital (2 * 0 + 1 = 1).
So in total, there are 6 orbitals: 1 for 1s, 1 for 2s, 3 for 2p, and 1 for 3s.
iii. Number of electrons having azimuthal quantum number = 1:
The azimuthal quantum number (m_l) represents the orientation of the orbital in space. The value of m_l can range from -l to +l in integer steps. For p orbitals, l = 1, so the possible values of m_l are -1, 0, and 1.
In this case, we're looking for the number of electrons with m_l = 1. In a full p orbital, there are 2 electrons with m_l = -1, 2 electrons with m_l = 0, and 2 electrons with m_l = 1.
Given that the atom has 15 electrons, it means that 2 of the electrons in the 2p subshell are unpaired (since there are an odd number of electrons). So in this case, there is 1 electron with m_l = 1.
divide 124.7 g by 25 cm3 and round off the answer
Answer:
5 g/cm³
Explanation:
When we divide the mass of a substance (124.7 g) by its volume (25 cm³), we are finding its density. Density is defined as the mass per unit volume of a substance and has the unit g/cm³. In this case, dividing 124.7 g by 25 cm³ gives us 4.988 g/cm³.
However, in order to simplify the answer, it is common practice to round off the density value to the nearest whole number. In this case, 4.988 g/cm³ can be rounded off to 5 g/cm³. So, the final answer is 5 g/cm³.
ALLEN
Using the table below, what is the color (we observe) of chlorophyll b if the pigment absorbs light at 460 nm?
Yellow is the correct answer .
What is Chlorophyll?
Chlorophyll is a green pigment that is essential for the process of photosynthesis in plants, algae, and some bacteria. It absorbs light energy from the sun and converts it into chemical energy, which is then used to produce organic compounds that the organism can use for energy and growth. Chlorophyll is found in specialized organelles called chloroplasts, which are present in the cells of photosynthetic organisms. There are several types of chlorophyll, but the most common types found in plants are chlorophyll a and chlorophyll b. Chlorophyll is also responsible for the green color of leaves and other photosynthetic tissues.
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The wavelength of energy required to photoionize X from its 3rd excited state is Y nm. Pick the sets of X and Y that are correct.
A: X: Li2+, Y: 163nm
B: X: Be3+, Y: 163nm
C: X: Li2+, Y: 91.6nm
D: X: Be3+, Y: 91.6nm
Answer:
D: X: Be3+, Y: 91.6nm.
Explanation:
The energy required to photoionize an ion from its excited state depends on the electron configuration and energy levels of the ion. Option D corresponds to the ionization energy for Be3+ from its 3rd excited state, which is known to be 91.6 nm. Options A and C correspond to incorrect ionization energies for Li2+ and cannot be the correct answer.
ALLEN
Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a
table.
Mass of weigh boat
2.193 g
Mass of weigh boat and sample 5.063 g
What is the mass of the solid sample (in g)?
The mass of the solid sample in grams would be 2.87 grams.
Weighing methodMass of the weighing boat = 2.193 grams
Mass of the weighing boat and the sample = 5.063
In other to determine the mass of the solid sample, the mass of the weighing boat needs to be subtracted from the mass of the weighing boat and the sample.
Mass of sample = Mass of sample+weighing boat - mass of weighing boat.
= 5.063 - 2.193
= 2.87 grams
In other words, the mass of the solid sample is 2.87 grams.
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3. Imagine that a radioactive isotope has a half-life of 2 years. A sample contains 1000 atoms of
the radioactive isotope. Complete the following table to predict how many atoms of the
radioactive isotope remain in the sample over time.
Time elapsed (years)
Number of radioactive atoms remaining
According to the concept of half-lives, atoms remaining after 2,4,6,8,10 years are 500,250,125,62.5,31.25 atoms respectively.
What is half-life?Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.
After 2 years ;1000/2=500 atoms
After 4 years ;500/2=250 atoms
After 6 years ;250/2=125 atoms
After 8 years;125/2=62.5 atoms
After 10 years ;62.5/2=31.25 atoms
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