Calculating the number of moles of air

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In summary, to calculate the number of moles of air in a sample, you would use the formula n = m / mass per mole. To solve for mass per mole, you need to determine the molar mass of air by knowing its composition and using the periodic table to find the molar mass of its components (hydrogen, oxygen, and carbon). Once you have the molar mass of air, you can then use it in the formula to find the number of moles of air in the sample.
  • #1
Dooh
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BY only given the mass of air in a certain sample, how would one calculate the number of moles of air in the sample?

n = m / mass per mole

however, what's mass per mole? and how would you solve for it? thanks.
 
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  • #2
Determine the molar mass of air, then use mass/molar mass to figure out the moles of air, then utilize that as you wish.
 
  • #3
yea, that's exactly what I am trying to figure out. How do you find the molar mass of air?
 
  • #4
To solve for mass per mole (a.k.a molar mass) you need to know the composition of the air. What is air made out of? How would you find the molar mass of hydrogen, oxygen, or carbon? (hint: it's all in the periodic table).
 

1. What is the formula for calculating the number of moles of air?

The formula for calculating the number of moles of air is: number of moles = mass of air (in grams) / molar mass of air.

2. How do you determine the mass of air in grams?

The mass of air in grams can be determined by weighing a specific volume of air using a scale, or by using the ideal gas law equation: mass = density x volume.

3. What is the molar mass of air?

The molar mass of air is approximately 28.97 grams per mole. This value can vary slightly depending on the composition of the air and the temperature and pressure at which it is measured.

4. Can the number of moles of air change?

Yes, the number of moles of air can change depending on changes in pressure, temperature, or the addition or removal of air molecules. However, in most practical situations, the number of moles of air remains constant.

5. How is calculating the number of moles of air useful?

Calculating the number of moles of air is useful in determining the amount of air present in a given space, which is important for various engineering and scientific applications. It can also be used to determine the amount of a specific gas present in a mixture of gases, such as in air pollution studies.

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