UNIT # 7 Introduction Objectives Problems 1 | 2 | 3 | 4 | 5

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*

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.

Conversion factor is:

molar volume of a gas at STP

because these quantities relate grams to moles and atomic mass or molar mass have units of

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.

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.

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

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