Answer:
81mg ÷ 1000 = 0.081g
0.081g ÷ 1.40g/cm3 = 0.058cm3
Explanation:
Firstly convert milligrams to grams. Use the mass to divide the density and find the volume in cm3
A compound contains C, H, I, S and has a molar mass of 229 g/mol. The sample has six times as much C
as H by mass. What is the molecular formula?
The molecular formula of the compound is CI4H12S4.
How to find the molecular formula of the compoundLet's assume that we have 6 grams of the compound, which means that 1 gram of the compound contains 1/6th of the total amount of the compound.
We are given that the compound contains C, H, I, S, and has a molar mass of 229 g/mol. Let's use x, y, z, and w to represent the number of moles of C, H, I, and S in one mole of the compound, respectively.
From the information given in the problem, we can set up the following system of equations:
x + y + z + w = 1 (since the sum of the mole fractions must equal 1)
12x = y (since the compound has six times as much C as H by mass)
To find the molecular formula of the compound, we need to determine the values of x, y, z, and w that satisfy these equations and give a molar mass of 229 g/mol.
The molar mass of the compound can be calculated as:
M = 12x + y + 127z + 32w
Substituting y = 12x from the second equation, we get:
M = 13x + 127z + 32w
We know that the molar mass of the compound is 229 g/mol, so we can set up the equation:
229 = 13x + 127z + 32w
We also know that x + y + z + w = 1, so we can substitute y = 12x, giving:
x + 12x + z + w = 1
13x + z + w = 1
We can solve these equations simultaneously to get:
x = 0.061
z = 0.504
w = 0.069
Substituting these values into the equation for the molar mass, we get:
M = 13(0.061) + 127(0.504) + 32(0.069) = 229
Therefore, the molecular formula of the compound is CI4H12S4.
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1) Precipitation reactions are ones in which ______________________________________________________.
2) Show how the cations and anions would swap in a double displacement reaction between AgNO3 and BaCl2.
The precipitation and double displacement reaction are as follows:
What is a precipitation reaction?
Precipitation reactions are ones in which two aqueous solutions containing ions react to form an insoluble solid compound, which is called a precipitate. Precipitation reactions are a type of double displacement reaction, in which cations and anions exchange partners.
These reactions typically occur when two soluble salts are mixed together, resulting in the formation of an insoluble compound. Precipitation reactions are commonly used in analytical chemistry to identify the presence of certain ions in a solution.
The double displacement reaction between silver nitrate (AgNO3) and barium chloride (BaCl2) can be written as follows:
AgNO3(aq) + BaCl2(aq) -> AgCl(s) + Ba(NO3)2(aq)
In this reaction, the silver ion (Ag+) and the chloride ion (Cl-) swap partners to form insoluble silver chloride (AgCl), which precipitates out of solution. The barium ion (Ba2+) and the nitrate ion (NO3-) also swap partners to form soluble barium nitrate (Ba(NO3)2), which remains in solution.
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An aqueous solution containing 35.5 g of an unknown molecular (non-electrolyte) compound in 158.6 g of water was found to have a freezing point of -1.4 ∘C.
An aqueous solution containing 35.5 g of an unknown molecular (non-electrolyte) compound in 158.6 g of water was found to have a freezing point of -1.4 ∘C. Therefore, 3.3 × 10² g/mol is the molecular mass.
What is molecular mass?The quantity of fill with a molecule is referred to as its molecular mass. It is also known as molecular weight.
It is computed by multiplying the mass for every atom by the amount of atoms belonging to the element that the molecule contains. Water, for example, is composed of two hydrogen atoms and one oxygen atom.
ΔT = i × Kf × m
m = ΔT / i × Kf
m = (1.4°C) / 1 × (1.86 °C/m) = 0.70 m
moles of solute = m × kg of solvent = 0.70 mol/kg × 0.1500 kg = 0.11 mol
M = 35.9 g/0.11 mol = 3.3 × 10² g/mol
Therefore, 3.3 × 10² g/mol is the molecular mass.
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A 33.41 g piece of copper at 95.6 Celsius was placed in a sample of water at 21.65 Celsius. The temperature of the water increased to 22.87 Celsius. To what mass of water was the cooper added? The specific heat of copper is 0.385 J/g C
Answer:
43.63 g of water.
Explanation:
We can use the equation for heat transfer to solve for the mass of water:
q = cmΔT
where
q = heat transfer
c = specific heat
m = mass
ΔT = change in temperature
The heat transfer from the copper to the water can be expressed as:
q = cmΔT
q = (33.41 g)(0.385 J/g°C)(95.6°C - 21.65°C)
And the heat transfer caused a change in temperature in the water, which can be expressed as:
q = mLΔT
q = (m)(4.18 J/g°C)(ΔT)
Equating the two expressions for heat transfer, we can solve for the mass of water:
(33.41 g)(0.385 J/g°C)(95.6°C - 21.65°C) = (m)(4.18 J/g°C)(22.87°C - 21.65°C)
m = (33.41 g)(0.385 J/g°C)(95.6°C - 21.65°C) / (4.18 J/g°C)(22.87°C - 21.65°C)
m = 43.63 g
So the copper was added to 43.63 g of water.
What is the wavelength, in meters, of an alpha particle with a kinetic energy of 8.0x10^-13 J?
Answer:
approximately 6.49x10^-12 meters.
Explanation:
To determine the wavelength of an alpha particle with a kinetic energy of 8.0x10^-13 J, we can use the de Broglie wavelength equation:
wavelength = h / p
where h is Planck's constant and p is the momentum of the particle.
To find the momentum of the alpha particle, we can use the equation:
p = sqrt(2mK)
where m is the mass of the alpha particle, K is its kinetic energy, and sqrt represents the square root.
The mass of an alpha particle is approximately 6.64x10^-27 kg. Substituting the given values, we get:
p = sqrt(2 x 6.64x10^-27 kg x 8.0x10^-13 J) ≈ 1.02x10^-19 kg m/s
Now we can substitute the values of h and p into the de Broglie wavelength equation to get:
wavelength = h / p = 6.626x10^-34 J s / 1.02x10^-19 kg m/s ≈ 6.49x10^-12 m
Therefore, the wavelength of an alpha particle with a kinetic energy of 8.0x10^-13 J is approximately 6.49x10^-12 meters.
Why is brine a more effective de-ice solution than solid ice melt products? select all that apply.
For the following reasons, brine is a more potent de-icing solution than solid ice melt products: Because brine freezes at a lower temperature than water, it can remain liquid at lower temperatures.
The typical use of brine, a salt-water solution, includes uses as a de-icing agent, a food preservative, and a source of minerals for industrial processes. Brine is a substance that is used in de-icing to either stop the growth of ice or to melt already-existing ice on sidewalks, highways, and other surfaces. It functions by bringing down water's freezing point, which causes ice to melt at lower temperatures. Compared to solid ice melt products, which may contain chemicals damaging to the environment, brine is typically seen as a more cost- and environmentally-friendly de-icing method. Brine is a common choice for de-icing applications since it is simple to prepare and use.
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In the greenhouse effect, far infrared radiation is earth's surface and absorbed and reemitted by gases in the atmosphere. These gases have in concentration over the past century.
In the greenhouse effect, gases in the atmosphere absorb and reemit far-infrared radiation that is released by the Earth's surface.
Thus, Over the past century, the concentration of these gases, also referred to as greenhouse gases, has risen.
The greenhouse effect is a natural process that aids in controlling the temperature of the Earth. Some of the solar energy that strikes the Earth's surface is absorbed and later reemitted as infrared energy.
By preventing some of the heat from escaping into space and trapping it instead, this mechanism causes the atmosphere to warm.
Thus, In the greenhouse effect, gases in the atmosphere absorb and reemit far-infrared radiation that is released by the Earth's surface.
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Select all statements that describe a general Diels-Alder reaction.
A. The reaction is initiated by heat.
B. The reaction involves the breaking of three π bonds.
C. The reaction is endothermic.
D. The reaction involves the formation of three new C-C σ bonds.
E. The reaction is concerted.
statements that describe Diels-Alder reaction. are A. The reaction is initiated by heat. D. The reaction involves the formation of three new C-C σ bonds. E. The reaction is concerted.
The Diels-Alder reaction is initiated by heat or light and involves the formation of new C-C sigma (σ) bonds. It is a concerted reaction, meaning that the breaking of the π bonds and the formation of the σ bonds occur simultaneously. The reaction is exothermic, not endothermic, as it releases energy upon the formation of the new bonds. Therefore, statements B and C are incorrect.
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a brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, which one rusted first if lead stayed on the longest and copper for the least
A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.
What is rust?Rust is an iron oxide, which is a typically reddish-brown oxide created by the catalytic interaction of iron with oxygen in the absence of water or air moisture. Rust is often connected with the corrosion of refined iron and is composed of hydrous iron(III) oxides (Fe2O3nH2O) with iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3).
Given enough time and the presence of oxygen and water, any iron mass may ultimately rust completely. A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.
Therefore, an iron rod will rust first if lead stayed on the longest and copper for the least.
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PLEASE BROO if the controlled substances, which schedule of drugs is the average person most likely to have in their homes? How are the controlled substances in this group different from those in the other schedule levels?
Answer:
The average person is most likely to have Schedule V controlled substances in their homes. These drugs have a low potential for abuse and limited dependence liability compared to other schedule levels. They are often used for medical purposes and include cough syrups containing codeine, anti-diarrhea medications, and some prescription pain medications.
The drugs in other schedule levels, such as Schedule I, II, III, and IV, have a higher potential for abuse and dependence and are considered to be more dangerous and addictive. These schedules include drugs such as cocaine, methamphetamine, fentanyl, and other highly regulated substances.
Explanation:
Given the chemical equation: 6 Cs + N₂
-2 CsgN
If the above reaction produces 58.3g of cesium nitride how much of the other substances were involved?
According to law of conservation of mass, if mass of product is 58.3 g the mass of nitrogen is 28 g and that of cesium nitride is 30.3 g which sums up to 58.3 g.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Mass of cesium nitride= mass of cesium + mass of nitrogen, thus, mass of nitrogen = 14×2=28 g and that of cesium is 58.3-28=30.3 g.
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Which number line represents the solution set for inequality 3x<-9 ?
A number line with 0 in the center and circle -3 to the left of it represents the solution set for inequality 3x<-9.
What is number line?A number line is a depiction of a graded single direction that serves as a visual representation of real numbers in primary mathematics. Every point on a number line is believed to correspond to something like a real number, and so every specific number to a point.
Given that the inequality is 3x-9,
Because 3 is a positive number, we may divide this discrepancy by 3 without affecting the less than sign.
i.e. x<-9/3
Or x<-3
Because -3 is strictly less than, we must have a hole at -3. (excluding -3)
Because there is a less than indication, the region on the number line to the left of -3 has a hole at -3.
Therefore, a number line with 0 in the center and circle -3 to the left of it represents the solution set for inequality 3x<-9.
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Part 6 Computation (12 points) 1. Calculate the average atomic mass of Iron using the chart provided. (6pts) Isotopic symbol 54Fe 56Fe 57 Fe 58Fe Natural Abundance (%) 5.8 91.7 2.2 0.3
Answer:
84.066 amu
Explanation:
The average atomic mass of iron can be calculated using the following formula:
Average atomic mass = (54Fe * 0.058 + 56Fe * 0.917 + 57Fe * 0.022 + 58Fe * 0.003) / (0.058 + 0.917 + 0.022 + 0.003)
Plugging in the numbers, we get:Average atomic mass = (54 * 0.058 + 56 * 0.917 + 57 * 0.022 + 58 * 0.003) / (0.058 + 0.917 + 0.022 + 0.003)
Average atomic mass = (31.12 + 51.592 + 1.254 + 0.174) / (0.058 + 0.917 + 0.022 + 0.003)
Average atomic mass = 84.066 / (0.058 + 0.917 + 0.022 + 0.003)Average atomic mass = 84.066 / 1
Average atomic mass = 84.066So, the average atomic mass of Iron is 84.066 atomic mass units (amu).
The rate constant for this first‑order reaction is 0.0990 s−1 at 400 ∘C. A⟶products After how many seconds will 19.4% of the reactant remain?
The rate constant for this first‑order reaction is 0.0990 s−1 at 400 ∘C. A⟶products, After 14.90 seconds will 19.4% of the reactant remain.
What is first order reaction ?The term first-order reaction is defined as a reaction that proceeds at a rate that depends linearly on only one reactant concentration.
We can use the formula;
0.693/t1/2 = 2.303/tlog (No/N)
Given that t1/2 = 0.693/k
= 0.693/0.0990 s − 1
= 6 seconds
Therefore,
0.693 / 6 = 2.303/t log 1/0.194
0.693/6 = 1.64/t
t = 1.64/0.11
t = 14.90 seconds
Thus, After 14.90 seconds will 19.4% of the reactant remain.
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Write a symbolic notation for atom with 5 protons and 4 neutron
Answer:
it's Beryllium
Explanation:
What is the first step in the immediate aftermath of exposure to a biohazard involving a percutaneous injury (through the skin)?
Calculate the number of atoms in 0.25 mol of silicon
Answer: 1.5 x 10^23 atoms
Explanation:
Answer:
1.505 x 10^23 atoms in 0.25 moles of silicon.
Explanation:
The number of atoms in 0.25 moles of silicon can be calculated as follows:
1 mole of any substance contains Avogadro's number of atoms. Avogadro's number is approximately 6.022 x 10^23 atoms/mole.
So, if we have 0.25 moles of silicon, the number of atoms can be calculated as follows:
0.25 moles x (6.022 x 10^23 atoms/mole) = 1.505 x 10^23 atoms
Therefore, there are approximately 1.505 x 10^23 atoms in 0.25 moles of silicon.
How does temperature affect the rate of a chemical reaction?
Answer:
Temperature affects the rate of a chemical reaction because it affects the rate of motion of the reacting particles. Higher temperatures increase the kinetic energy of particles, which increases their rate of collision and reaction.
Explanation:
Which crop did texas farmers produce the most of in the years after the civil war?.
In the years after the civil war texas farmers produced cotton the most among all crops,
The Importance of Cotton in Texas Agriculture After the Civil WarIn the years following the Civil War, cotton was the most important cash crop in Texas and the primary source of income for many farmers. Texas had favorable climatic conditions and fertile soils that were well-suited for cotton cultivation. Additionally, the demand for cotton was high both domestically and internationally, which made it a lucrative crop for farmers. As a result, cotton production in Texas increased significantly in the years after the Civil War, with the state becoming one of the largest cotton producers in the country. However, this dependence on a single crop also left farmers vulnerable to market fluctuations and crop failures, which led to economic hardship and debt for many.
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calculate the mass of sodium chlorite that must be decomposed to form 6.5g of oxygen 2NaClO3(s) —> 2NaCl(s) +3O2(g)
Answer:
14.39 g of sodium chlorite must be decomposed to produce 6.5 g of oxygen gas
Explanation:
We can start by using the balanced chemical equation for the reaction:
2NaClO3(s) -> 2NaCl(s) + 3O2(g)
This equation tells us that for every 2 moles of sodium chlorite that are decomposed, 3 moles of oxygen gas are produced. To find the mass of sodium chlorite that must be decomposed to produce 6.5 g of oxygen, we need to know the molar mass of oxygen, which is 32 g/mol.
Since 6.5 g of oxygen is equal to 6.5 / 32 = 0.203 moles of oxygen, we can use the balanced chemical equation to determine the number of moles of sodium chlorite that must be decomposed:
0.203 moles of oxygen = (0.203 moles of oxygen) / (3 moles of oxygen / 2 moles of sodium chlorite) = 0.203 * (2 moles of sodium chlorite / 3 moles of oxygen) = 0.135 moles of sodium chlorite
Finally, we can use the molar mass of sodium chlorite, which is 106 g/mol, to find the mass of sodium chlorite that must be decomposed:
0.135 moles of sodium chlorite * 106 g/mol = 14.39 g of sodium chlorite
Which substance can be classified as an Arrhenius acid
Answer:
HCl (Hydrochloric acid) can be classified as an Arrhenius acid.
Explanation:
An Arrhenius acid is a substance that donates hydrogen ions (H+) in an aqueous solution, resulting in an increase in the hydrogen ion concentration (pH). Examples of Arrhenius acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3).
Answer:
HCl (Hydrochloric acid)
Explanation:
Al2(SO4)3 amount of atoms?
Answer:
17 atoms
Explanation:
So there are two aluminum atoms, three sulfur atoms, and 12 oxygen atoms in a single unit of the compound Al2(SO4)3. This sums to 17.
The density of cobalt is 8.86 g/cm³. The mass of the average atom of cobalt is 9.786316
x 10-23g. How many atoms of cobalt are contained within 1.00 cm³ of cobalt?
In this question, the density of cobalt is equal to 8.86 g per cubic centimeter. The mass of average atom of cobalt is equal to 9.786 316 times 10. Raise to part minus 23 grand. So this is the mass of average item of cobalt. And we have to calculate the number of atoms of cobalt, when volume is equal to one cc. So in one cc of cobalt we have to calculate the number of atoms of COBOL present. First of all, using the formula that density is equal to mass divided by volume. We can calculate the mass of atoms present in one cc. So the mass would be equal to density, multiplied by volume. From this mass comes out to be density is 8.86 g per centimeter cube and volume is one centimeter tube. So the mass would be equal to 8.86 g. Now we have the mass of atoms present in one cc of COBOL. Now, since mass is 8.86 g and we know that 9.7863 16 times 10 raise to part -23 g is equal and to one atom since it is a mass of average atom of cobalt. So from this we can say that 8.86 g of cobalt would be equal to one divided by 9.7686316 multiply by 8.86 atoms of Cobalt. From this. By solving it, we will get the value which is equal to when we multiply and divide these things. We will get the value 9.5 times 10, raise to part 22 atoms, so 9.5 Multiply by 10 days to part 22 items are present in 8.86 g of cobalt. Or we can say that one cc of cobalt. So our answer is option A.
I hope this helps! o(〃＾▽＾〃)o
Which energy output object(s) work with the turbine?
Choose all that are correct.
water heater
fluorescent light bulb
incandescent light bulb
fan
Yes, all of these energy output objects can work with a turbine. Turbines are designed to convert energy from a source, such as the wind or flowing water, into useful forms of energy, such as electricity or movement.
What is energy?Energy is an important concept in physics that describes the capacity of a physical system to do work. It is often described as the ability to do work and can be found in many forms, including kinetic energy, potential energy, thermal energy, electrical energy, and chemical energy. Kinetic energy is the energy of motion and is the result of an object's movement. Potential energy is the stored energy of an object due to its position or configuration. Thermal energy is energy contained in the movement of particles and is related to temperature.
This energy can then be used to power a variety of energy output objects, such as water heaters, light bulbs, and fans.
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A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of dimethyl sulfoxide, acetone, diethytamin, tetrahydrofuran, and carbon tetrachloride. The chemist plans to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSOS), the chemist finds the following information: Next, the chemist measures the volume of the unknown liquid as 0.767 L and the mass of the unknown liquid as 682. g. Calculate the density of the liquid. Round your answer to 3 significant digits. g. cm^-3 Given the data above, is it possible to identify the liquid? yes no If it is possible to identify the liquid, do so. dimethyl sulfoxide acetone diethylamine tetrahydrofuran carbon tetrachloride times 10
Yes, it is possible to identify the liquid, and the density of the liquid is closest to 0.889 g/cm³ so the liquid is most likely tetrahydrofuran.
To calculate the density of the unknown liquid, we use the formula:
Density = Mass / Volume
Substituting the given values, we get:
Density = 682. g / 0.767 L
Density = 888.5 g/L
Rounding to three significant digits, the density of the unknown liquid is 889 g/L.
Using the information provided in the question, we can compare the density of the unknown liquid to the known densities of the listed chemicals. The densities (in g/cm³) of the chemicals are:
Dimethyl sulfoxide: 1.092
Acetone: 0.790
Diethylamine: 0.707
Tetrahydrofuran: 0.889
Carbon tetrachloride: 1.594
Comparing the density of the unknown liquid to the known densities, we see that it is closest to the density of tetrahydrofuran, which is 0.889 g/cm³. Therefore, it is likely that the unknown liquid is tetrahydrofuran.
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If the volume of the reaction vessel in the previous part was 1. 25 l , what amount of br2 (in moles) was formed during the first 15. 0 s of the reaction?.
0.4 amount of br2 (in moles) was formed during the first 15. 0 s of the reaction.
A chemical reaction is a process that causes a chemical transformation of one set of chemicals into another. Classically, chemical reactions involve changes involving only the position of electrons in the formation and breaking of chemical bonds between atoms, and changes in the nucleus (no change in the elements present) can often be described by chemical equations. Nuclear chemistry is a subset of chemistry that involves the chemical reactions of unstable radioactive elements in which both electronic and nuclear changes can occur.
Now,
Correct option is (C)
N2 +O2 ⇌2NO
At t = 0 2 4 0
At eq. 2-x 4-x 2x
Half a mole of nitrogen is used up at equilibrium,
x = 0.5
So, moles of NO=1.
Molar concept of NO at equilibrium = 1/ 2.5
= 0.4.
Complete Question:
The equilibrium N₂(g)+O₂(g)⇌2NO(g) established in a reaction vessel of 2.5 L capacity. The amounts of N₂ and O₂ taken at the start were respectively 2 moles and 4 moles. Half a mole of nitrogen has been used up at equilibrium. The molar concentration of nitric oxide is :
(1) 0.2 (2) 0.8 (3) 0.6 (4) 0.1
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If you have 24 bun slices, 8 hamburger patties, 10 slices of cheese, 12 pieces of bacon, 10 tomato slices and 10 slices of lettuce, what is the maximum amount of hamburgers you can make?
Answer:
8
Explanation:
because you only have 8 hamburger patties
See question in the picture below , will give brainliest for correct answer
Answer:
2H²+O²--> 2H²O (sry subscripts can't be written on moblie)
Explanation:
the first part of the reaction shows 4 hydrogen atoms and 2 oxygen atoms, and the second formula shows the same
While doing calculations after a chemical analysis was
completed, Johanna discovered that 164.2 mol of Na₂CO3
were formed. How many grams of product were formed?
The term mole concept is used here to determine the grams of product formed. The grams of product formed is 17401.9 g.
What is mole?One mole of a substance is that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon - 12.
Number of moles = Given mass / Molar mass
The molar mass of Na₂CO3 = 105.98 g/mol
Then the mass of Na₂CO3 = Molar mass × Number of moles
= 105.98 g/mol × 164.2 mol
= 17401.9 g
Thus the grams of product formed is 17401.9 g.
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Co and CO are:
A. The Same element
B. The same molecule
C. Co is an element and CO is not.
D. Co is a molecule and CO is not
Answer:
C.
Explanation:
in CO there are 2 capital letters,but in Co there is 1 capital letter because its an element.
Answer: c. Co is an element and CO is not
Explanation:
Co and CO are two different chemical substances. Co is the metal element named cobalt whereas CO is the inorganic compound i.e. carbon monoxide.
Co is a chemical element with atomic no. 27 and CO is an inorganic compound consisting of atoms of carbon and oxygen.
co is a metal whereas CO is a gas.
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