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Answer 1 · 2014-10-21T00:59:47

Use the fact that a mole of any gas occupies a volume of 24L at room temperature and pressure.

Here is an example: "What is the volume occupied by 2.2g of #CO_2# at room temperature and pressure ? "

The #M_r# of #CO_2# is 12 + (2 x 16) = 44

so 44g occupies 24L
so 1g occupies 24/44 = 0.5 L
So 2.2g occupies 0.5 x 2.2 = 1.1L

If we are not under standard conditions you may to use The Ideal Gas Equation:

#PV=nRT#

Where P = pressure
V = volume
T = the absolute temperature
n = the no. of moles
R = the gas constant = 8.31J/K/mol