Answer:
the net force which is a vector sum
Explanation:
The net force is the vector sum of all the forces
That is, the net force is the resultant of all the forces
The vector sum of all the forces is called as the net force. In other words, the net force is the sum of all forces. Thus, option A is correct.
What is the sum of all forces acting on an object?The mass times the acceleration equals the sum of the forces. According to the second law, the acceleration is equal to zero if the object or system is not moving. As a result, the vector forces' sum must be zero.
The net force is the result of the vector sum of all the forces acting on a body. The item is considered to be in equilibrium if the net force is equal to zero.
The process of adding two or more vectors together to create a vector sum is known as vector addition. The so-called parallelogram law lays forth the guidelines for adding two or more vectors together.
By aligning the two vectors and head to tail and drawing the vector from the free tail to the free head, the vector total for the pair and may be calculated.
Therefore, vector sum best describes the sum of all forces acting on an object.
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Solve the following problem:
How many seconds are in 3 years?
Please show your work. You will need to include the following conversion factors:
• 365 days/1 yr or 1 yr/365 days
1 day/24 hours or 24 hours/1 day
.60 min/1 hour or 1 hour/60 min
. 1 min/60 sec or 60 sec/1 min
Answer: 94,608,000 seconds
Explanation:
365 days/1 yr=365
24 hours/1 day=24
60 min/1 hour=60
60 sec/1 min=60
365*24*60*60=
8760*3600=31536000 seconds in 1 year.
31536000*3=94608000 seconds
It cost $35.57 to drive the school bus for 94.00 miles.
Given:
Distance to drive (D) = 94.00 miles
Miles per gallon (MPG) = 6.500 miles/gallon
Cost of gas (C) = $2.459/gallon
Step 1: Calculate the amount of gas required for the trip.
Gas consumed = Distance / Miles per gallon
= 94.00 miles / 6.500 miles/gallon
= 14.4615 gallons
Step 2: Calculate the cost of gas for the trip.
Cost of gas = Gas consumed * Cost per gallon
= 14.4615 gallons * $2.459/gallon
= $35.57
Therefore, it will cost $35.57.
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Write a balanced redox reaction between acidified potassium permanganate and iron two chloride and predict if the reaction is spontaneous Emno.4/Mn^2+=1.74v fe^2+|fe^3+=0.75
The balanced redox reaction between acidified potassium and iron two chloride is given as ,
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] ++ 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous
Place these numbers as coefficients in front of the formulas containing those atoms.
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance all remaining atoms other than H and O
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance O.
Add enough H2O molecules to the deficient side to balance O.
We have 4O atoms on the left, so we need 4H2O
on the right.
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] + 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous when the value of E ° for the reaction is positive .
E ° for [tex]MnO_{4} ^{- }[/tex]/ [tex]Mn^{+2 }[/tex] = 1.74 V
E ° = [tex]Fe^{+3}[/tex]/ [tex]Fe^{+2}[/tex] = 0.75 V
E ° for reaction = 1.74 V - 0.75 V = 0.99 V
Hence , E ° for reaction is positive .
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A rectangular piece of copper, 2.13 cm by 0.79 cm by 1.14 cm, weighs 17.11g. What is the density of the copper?
Density of copper is 8.92 g/cm3.
The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol(p), although Latin letter D may also be used.
Given:
weight of copper = 12.11 g
Volume = 2.13 cm * 0.79 cm * 1.14 cm
= 1.918 cm3
As we know that ,
Density = mass / volume
d = m/v
d = 17.11 / 1.918
density = 8.92 g/cm3
Density of copper is 8.92 g/cm3.
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There are 25 elements found in living things. How many of these elements are found in some organisms but not all?
1
6
19
25
Answer: 6
Explanation: There are 25 elements found in living things. How many of these elements are found in some organisms but not all? 1 6 19 25
Question 5 of 10
When you think about whether most people are basically good or basically
bad, you are:
A. repeating beliefs you learned from your family.
B. exploring your own beliefs.
C. deciding what actions to take in your life.
OD. accepting the values of others.
SUBMIT
When you think about whether most people are basically good or basically
bad, you are exploring your own beliefs.
A person's beliefs will influence how they make decisions and react to circumstances. Most often, beliefs are established throughout childhood or other formative experiences.According to psychology, Beliefs can be positive or negative. Finding one's core beliefs can be difficult at times. It can take a lot of introspection, and some people might need a therapist's help to uncover their core beliefs.The downward arrow method can be used to identify your core beliefs. This entails tracing each idea back to the fundamental belief it was based on.You might occasionally make unfair or unjust assumptions about someone as a result of your attitudes and beliefs.therefore, according to the above-explained points, the above statement justifies the point of exploring your own beliefs.
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which statement concerning the oxygen level in the lake can be inferred from the graphs. 1) the increase of the sewage waste from 1950 to 1970 was due to decreasing human population. 2) the decreasing and sewage Way shows the environmental problems associated with the lamb population have been solved. 3) sewage waste is a good source of nutrients for most of fish.4) increases in sewage ways were responsible for decreasing oxygen levels in the lake
Increases in sewage waste were responsible for decreasing oxygen levels in the lake
Humans does have the impact on the environment in several ways. Common effects includes lowered water quality, elevated pollution and greenhouse gas emissions, depletion of natural resources and contribution to global climate change.
As global temperatures increasing , weather patterns on earth will dangererously change. While some areas will have longer growing seasons, others will become drought wastelands as water will decrease in vast areas, turning once floral regions into deserts. The elevation will impact weather patterns, provoking more intense hurricanes in both size and frequency, as well as intensifying and prolonging droughts and heat waves. But air pollution not only just effect the environment . The evidence is increasing that poor air quality and rising temperatures are ruining delicate ecosystems, even led to increased asthma and cancer rates in humans.
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Can somebody help me so I can give you a brain list if it right
Answer:true
Explanation:
if you change the sequence, the answer you get may be wrong.
The lab procedure says, "weigh 1.0 g of sodium chloride." Which of the following are acceptable masses?
The lab procedure
The 150 mL beaker's contents should be emptied into the sink, followed by a thorough water rinse of the beaker and temperature probe sodium . Add 20 g of ice to the beaker after weighing it.
sufficient water to make the combined weight match the combined weight of the ice and water consumed above. Put the thermometer in the slush, press the green button, and agitate the mixture.
For two minutes, slush. sodium Stir the slush while adding the 1.0 g of salt chloride. five minutes Simply press the red button. After saving the data, select Store Latest Run from the list.
The menu for experiments print the graph with both the sodium chloride and urea plots visible at once. sodium Which plot corresponds to which solid should be noted on the printout.
The 150 mL beaker's contents should be emptied into the sink, followed by a thorough water rinse of the beaker and temperature sodium .
Simply select Show Data Set from the Data menu, followed by the Run # you want to display, to examine one of your earlier plots. It is possible to display multiple pieces of data at once.
The Latest Run is the most recent Run, and the Runs are numbered consecutively in the order in which they were acquired. To display the chosen plot or plots, just use the commands Hide Data Set and Show Data Set. The plot display settings (such as axes scaling, etc.) may need to be changed.
Display one or both students' temperature charts using the y-axis label, as desired. The Data menu also includes options for deleting individual data sets.
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How do you find the number of
electrons in a neutral atom?
235 miles converted to kilometers
Answer:
378.196
Explanation:
Multiply the length value by 1.609.
235 miles = 378.196 kilometers
Answer:
378.196 Kilometers
Explanation:
For an approximate result, multiply the length value by 1.609.
235*1.609 = about 378.2
If the bond length in a XY molecule is 212,
what will be the covalent radius of atom X, if
the covalent radius of Y atom is 93.
O
119
2.27
128
3
Answer:
The correct answer is 119.
Explanation:
We are given the bond length of XY is 212.
The covalent radius of Y = 93.
Now this means that the bond length(R) is sum of the radio of X and Y Atom.
So, R(XY)=r(X)+r(Y)
212 = r(X)+93
r(X)= 119.
Therefore, the covalent radius of X is 119.
I hope this helps, have a good day! :D
Bond length is the distance between two bonded atoms. The covalent radius of X in XY molecule with bond length 212 and Y with a covalent radius of 93, is 119.
What is covalent radius?Covalent radius is the measure of the atomic size bonded with another atom through covalent bond. Covalent bonds are formed between non-metals with comparable electronegativities.
Bond length of molecule is the distance between the two bonded atom. Mathematically bond length of a covalent compound is the sum of covalent radius of the two bonded atoms.
The bond length of the molecule XY is given as 212 and the covalent radius of Y atom is 93. The bond length 212 is the sum of covalent radius of Y and covalent radius of X.
Covalent radius of X = 212 - 93 = 119.
Therefore, covalent radius of X atom in the XY molecule with bond length 212 and Y atom with covalent radius of 93 is 119 thus, option a is correct.
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3 The chemical compositions of two substances, W and X, are given.
W Na(AISI³)O8
X Ca(Al₂Si₂)08
Which statements are correct?
1 W and X contain the same amount of oxygen.
2 W contains three times as much silicon as X.
3 X contains twice as much aluminium as W.
A) 1 and 2 B) 1 and 3 C) 2 and 3 D) 1, 2 and 3
Answer:
D) 1,2 and 3 is the answer
When a large object fell into a full swimming pool, it displaced 33.8 gallons of water. The density of the object is 1.65 g/mL. What is the object's weight in pounds?
If the density of the object is 1.65 g/mL. The object's weight in pounds m = 483.32 pounds.
what is density ?The density can be defined as the mass per unit volume which can be described it is the ratio between mass and volume.
Density is a measurement of matter, where it determine how tightly the matter is bond together, discovered by the Greek scientist Archimedes.
To calculate the density of an object, Density = Mass/Volume
The density of the object is 1.65 g/mL, Volume of the water is 35.1 gallons
1 gallon = 3785.41 mL
35.1 gallons = 132868 mL
1 pound = 453.592 grams
So, 219232.2 grams = 483.32 pounds weight.
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0.3060 x 10^17 atoms of Kr(g) = how many moles ?
There are 0.05 x [tex]10^{-6}[/tex] number of moles of Kr(g) having 0.3060 x [tex]10^{17\\}[/tex]atoms .
A mole is 6.02214076 x 1023 of any chemical unit, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful measure to utilize.
Calculation .
One mole of the any atoms contains 6.022 x [tex]10^{23}[/tex] atoms .
So , the number of moles of Kr(g) having 0.3060 x 10^17 atoms is calculated as ,
number of moles of Kr = 0.3060 x [tex]10^{17\\}[/tex]atoms x 1 mole / 6.022 x [tex]10^{23}[/tex]atoms
number of moles of Kr = 0.05 x [tex]10^{-6}[/tex] mole
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what to use to measure The volume of a small stone.
Answer:
One way to measure the volume of any irregular object (in your case, a stone) is to submerge it completely under water and measure the change in the height of the water level.
Explanation:
Answer: WELCOME TO BRAINLY
Explanation: One way to measure the volume of any irregular object (in your case, a stone) is to submerge it completely under water and measure the change in the height of the water level. This change in the water level (let's say it goes from 50 mIlliliters to 65 milliliters) indicates that the stone has a volume of 15 milliliters.
Hope this helps!
Question 8 of 8
Which statement best describes what happens when thermal energy of the
air around a fire is transferred to the surrounding air?
A. The thermal energy is destroyed as it changes to chemical energy.
OB. The thermal energy is destroyed over time.
C. The thermal energy is spread out by the surrounding air.
D. The thermal energy changes to chemical energy.
Answer:
Explanation:
A) The thermal energy is spread out by the surrounding air would be the right answer
hope you get it right :)
PLEASE HELP
Claim: Write a Claim statement
How does the abundance(amount) of each isotope affect the average atomic mass of a mixture of atoms of the same element?
The average atomic mass of a mixture of atoms of the same element will...
The abundance(amount) of each isotope determines the relative atomic mass.
What is the relative atomic mass?The relative atomic mass refers to the mass of the atom that is obtained by adding together the products of the relative atomic masses of each isotope and the relative abundance of the isotope.
Hence, we can say that, since the relative atomic mass takes into account the masses and percentage abundance of all the isotopes, it then follows that the abundance(amount) of each isotope determines the relative atomic mass.
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2 NO(g) + O₂(g) 2 NO2(g)
5.)
A student investigates the reactions of nitrogen oxides. One of the reactions in the investigation requires an equimolar
mixture of NO(g) and NO, (g), which the student produces by using the reaction represented above.
(a) The particle-level representation of the equimolar mixture of NO(g) and NO₂(g) in the flask at the completion of the
reaction between NO(g) and O, (g) is shown below in the box on the right. In the box below on the left, draw the
particle-level representation of the reactant mixture NO(g) and O₂(g) that would yield the product mixture shown in
the box on the right. In your drawing, represent oxygen atoms and nitrogen atoms as indicated below.
Oxygen atom =
Reactant Mixture
Nitrogen atom =
Product Mixture
The moles of oxygen and nitrogen (ii) oxide required to give the product is 2 moles of oxygen and 8 moles of nitrogen.
What is a chemical reaction?A chemical reaction is a reaction in which atoms of elements or compounds undergoes changes to form new substances.
Chemical reactions are not easily reversible as a result of the large heat changes involved.
In the given reaction, oxygen reacts with nitrogen (ii) oxide to form nitrogen (iv) oxide.
The equation of the reaction is given below:
2 NO(g) + O₂(g) 2 NO₂(g)Considering the particle diagram shown, the product mixture consists of four moles of nitrogen (iv) oxide and four moles of nitrogen (ii) oxide. This indicates that the nitrogen (ii) oxide that reacted with oxygen was in excess.
From the equation of reaction, one mole of oxygen reacts with nitrogen(ii) oxide to produce two moles of nitrogen (iv) oxide.
Therefore, moles of oxygen that reacted with nitrogen(ii) oxide = 4 moles * 1/2 = 2 moles
moles of nitrogen (iv) oxide that reacted will be:
4 moles (unreacted) + 2 * 2 moles = 8 moles.
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C4H8(g)⟶2C2H4(g)
has an activation energy of 262 kJ/mol.
At 600.0 K, the rate constant, , is 6.1×10−8 s−1. What is the value of the rate constant at 820.0 K?
The value of the rate constant at 820.0 K is 0.2 s^-1
Applying the Arrhenius equation, which is...
k = Ae-Ea/RT
Applying the formula, we get
lnk2 = lnk1 - (Ea/R)(1/T2 - 1/T1)
Applying the values, we get
ln k2 = ln 6.1x10^-8 - (2.62x10^3/8.314)(1/820 - 1/600)
Calculating the value, we get...
ln k2 = -0.31
Taking power e, we get
k2 = 0.2 s^-1
Arrhenius equation relates the temperature and activation energy of a reaction.It is helpful in studying the different parameters related to reaction.Activation energy is the minimum required to attain to form the product.To learn more about the activation energy visit:
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Which of the following statements is a hypothesis?
A Why do I see more rats at a smoker's house than
a non-smoker's house
B I think that cigarette smoke increases the
appetite of rats
C
I will place three rats in three separate cages and
expose them to varying amounts of cigarette smoke
D The rat which exposed to the most smoke, ate a
larger amount of cheese compared to the other rats
Correct hypothesis is 'i will place three rats in three separate cages and
expose them to varying amounts of cigarette smoke'
Here given statement C is correct in hypothesis because when we place three rats in three separate cages and expose them to varying amounts of cigarette smoke then 50% rat are kill because nicotine concentration in the mainstream smoke particulate matter of reference cigarettes are 70%-8% and it take 20 min to kill the rats
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What type of scientist uses mathematics to propose untested ideas
Answer: theoretical scientist
Explanation:
This is an impossible formula. Pretend it is real.
If you had 1 mol of Mn9(ClO4)2 how many moles of O would there be?
Remember that you should never include a 1 as a subscript but for the sake of clarity for this problem you may see a 1 as a subscript.
Make sure your answer includes TWO decimal places.
There are eight moles of oxygen atoms in 1 mole of [tex]Mn_{9}(ClO_{4}) _{2}[/tex].
What is the number of moles of oxygen atoms?We know that a compound is composed of atoms. The atoms that make up the molecule are chemically combined. It is usual that the number of atoms in the compound would correspond with the chemical formula.
Now we have the compound [tex]Mn_{9}(ClO_{4}) _{2}[/tex]. In one mole of the compound we have;
9 Moles of manganese atom2 moles of chlorine atom8 moles of oxygen atomThus, there are eight moles of oxygen atoms in 1 mole of [tex]Mn_{9}(ClO_{4}) _{2}[/tex].
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Describe a chemical change using atoms and molecules?
Explanation:
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products. In a chemical reaction, only the atoms present in the reactants can end up in the products.
Answer:
In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.
Explanation:
Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.
Red gold is a gold-copper alloy used to make jewlery. A piece of jewlery made of red gold weighs 8.97g and has a volume of 0.528cm3. Gold has a density of 19.3g/cm3 and copper has a density of 8.96g/cm3. Calculate the percentage by mass of each metal in jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains
Percent of gold and copper are 88.2 and 11.8
Red gold is a gold-copper alloy used to make jewelry .
Let the mass of gold be m1
Let the mass of copper be m2
We are given that m1+m2 =8.97 g
We know that volume is the ratio of mass to density
Thus
m1/d1 + m2/d2 = 0.528 cm3
where d1 and d2 is the density of gold and copper
m1/19.3 + m2/8.96 = 0.528
8.96m1 +19.3 m2 = 0.528 x 19.3 x 8.96 = 91.305
putting m1 = 8.97 - m2
8.96 ( 8.97 - m2 ) + 19.3 m2 = 91.305
80.3712 - 8.96m2 + 19.3 m2 =91.305
10.34 m2 = 91.305-80.3712
m2 = 10.9338 /10.34
=1.0537gm
m1=8.97-1.0537
=7.91gm
Therefore, percent of gold = 7.91/8.97 x 100 =88.20%
percent of copper = 100-88.2=11.8%
Therefore, percent of gold and copper are 88.2 and 11.8
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A stone with a mass of 10 kg sits on the ground. Gravity acts on the stone at a rate of 9.8 m/s2. What is the normal force
acting on the stone, keeping it at rest? (1 point)
O 1.02 N
O 9.8 N
O 10 N
O98 N
Answer:
Fn = m x g
Fn = normal force
m = mass of the stone
g = gravitational force acting on the stone.
therefore, fn=m x g = 10kg x 9.8m/s2 = 98 kgm/s2 or 98 N. Which is the same as 098 N.
Explanation:
A stone with a mass of 10 kg sits on the ground. The normal force acting on the stone, keeping it at rest, is 98 N. The correct option is D.
What is force?A force is a power that changes the position of an object. This results in the action or movement of any object. Force is calculated in Newton. The force can be calculated by multiplying the mass by acceleration.
Given, the mass of the stone is 10 kg
The gravitational force act at the rate of 9.8 m/s²
The formula is
Force = mass x gravitational rate
Fn = normal force
m = mass of the stone
g = gravitational force acting on the stone
So, fn = m x g
10kg x 9.8 m/s²
98 kg m/s²or 98 N
Therefore, the normal force acting on the stone, keeping it at rest, is 98 N. The correct option is D.
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A "fuzzy cloud" around the nucleus of an atom where an electron is likely to
be found is called
a) an orbital b) valence shell c) ground state
d) none of these
A "fuzzy cloud" around the nucleus of an atom where an electron is likely to be found will be called an orbital. Option A.
What are orbitals?Orbitals are regions within the atom where electrons can be found.
A typical electron contains electrons that are negatively charged, protons that are positively charged, and neutrons that have no charges.
The positively charged protons and neutral neutrons form the core or the nucleus of the atom. The electrons, on the other hand, are located outside the nucleus.
The regions where electrons of atoms are located are collectively called orbitals.
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Write an equation that shows the formation of the bromide ion from a neutral bromine atom.
The equation that shows the formation of the bromide ion from a neutral bromine atom is as follows: Br + e- → Br-
What is an ion?Ion is the atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.
An atom becomes an ion when it loses or gains electrons.
According to this question, bromine atom is neutrally charged but quicky becomes charged into an ion when it gains one electron. The equation is represented as follows:
Br + e- → Br-
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The nucleus of an atom contains which subatomic partcles?
Answer:
The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge.
How many moles are present in each of the following at STP?
A.54.5 dm3 CH4
B.250.0 cm3 CO
1. The number of mole of 54.5 dm³ of CH₄ at STP is 2.43 moles of CH₄
2. The number of mole of 250 cm³ of CO at STP is 0.01 mole
Volume of gas at STPAt standard temperature and pressure (STP),
1 mole of gas = 22.4 dm³ = 22400 cm³
1. How to determine the mole of 54.5 dm³ of CH₄At standard temperature and pressure (STP),
22.4 dm³ = 1 mole of CH₄
Therefore,
54.5 dm³ = (54.5 dm³ × 1 mole) / 22.4 dm³
54.5 dm³ = 2.43 moles of CH₄
2. How to determine the mole of 250 cm³ of COAt standard temperature and pressure STP,
22400 cm³ = 1 mole of CO
Therefore,
250 cm³ = (250 cm³ × 1 mole) / 22400 cm³
250 cm³ =0.01 mole of CO
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The density of air is 1.29 grams/Litre. What is the weight, in kilograms of a cubic metre (1.00 m^3) of air?
The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg
How can you calculate the density of humid air?Humid air's density can be calculated by treating it as a mixture of ideal gases. The vapour pressure is the partial pressure of water vapour in this case. In the temperature range of 10 °C to 50 °C, the density calculation error is less than 0.2% using this method.
given that
Density =mass/ volume
1.29grams/ liter =[tex]\frac{mass}{m^{3} }[/tex]
1 liter = 0.001 [tex]m^{3}[/tex] and 1 kilogram = 0.001grams
0.00129 kg/[tex]m^{3}[/tex] = mass / 0.001 [tex]m^{3}[/tex]
mass =0.00129 kg/[tex]m^{3}[/tex] /0.001 [tex]m^{3}[/tex]
which means,
mass= 1.29 kg
The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg
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