1.20 understand the term molar volume of a gas and use its values (24 dm3 and 24,000 cm3) at room temperature and pressure (rtp) in calculations.

One mole of any gas has a volume of 24 dm³  or 24,000 dm³  at room temperature. This is the molar volume of gas

Method 1: Calculating volume of gas from amount of gas 

volume of gas (dm³) = amount x 24

volume of gas (cm³ ) = amount x 24,00 

Worked example: Hydrogen gas – 

Amount: 3 mol

Volume = 3 x 24 = 72 dm³ 

Method 2: Calculating amount of gas from the volume of gas 

Amount of gas (moles) = volume (dm³ ) / 24  or volume cm³  / 24,000 

Worked example: Sulphur  dioxide 

Volume = 960 dm³ 

Amount = 960 / 24 = 40 mol

This is a paper 2, triple science fact
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