CALCULATIONS BASED ON FORMULAE

7.6 - Molar Volume of a Gas

7.6.1 - Molar volume calculations

Using the molar volume of a gas at STP, you to calculate the volume that a gas sample occupies at STP condition if you're given one of the following:

1. the number of moles of gas sample
2. the mass of the gas sample*
3. the number of atoms (or molecules) of the gas sample*
   

* (Note: If you are given mass or number of atoms (or molecules of the gas) of the gas sample, you would need to convert those quantities tothe number of moles of gas sample before proceeding to find the volume that the gas occupies at STP. Click for a review of how to interconvert between mass and moles, and number of atoms (or molecules) and moles.)

After you obtain the number of mole of gas sample, then you can use the molar volume at STP as a conversion factor to calculate the volume that the gas sample occupies under STP conditions.

To calculate the volume that a gas sample occupies at STP when given the number of moles of gas, use molar volume at STP as the conversion factor.

1. Given number of moles of gas, calculate the volume of the gas at STP.

you need to multiply by the molar volume of the gas at STP. Click to see a detailed summary.

2. Given the volume of the gas at STP, calculate the number of moles of gas.

you need to divide by the molar volume of the gas at STP. Click to see a detailed summary.

Section 8.3
Molar Volume of a Gas and Related Calculations ..p195

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