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Molar Volume

The molar gas volume Vm is the volume per mole of gas molecules at a stated temperature and pressure.
Many experiments are carried out at room temperature and pressure (rtp) of 20°C and 1 atm of pressure (101kPa).At rtp, 1 mole of any gas occupies 24 dm3.To calculate the volume at rtp, work out the number of moles and then multiply by 24dm3The Ideal Gas EquationThe molecules that make up an ideal gas are in constant random motion. Assumptions:Collisions are elastic, the size of the molecules are negligible compared to the volume of the gas and there are no intermolecular forces.The ideal gas equation is:

pV = nRT


where p is the pressure in Pa, V is the volume in m3, n is the number of moles, T is the temperature in kelvin and the molar gas constant R = 8.314 Jmol-1K-1.

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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 5: Formulae, Equations and Amounts of Substance. Topic: Amount of Substance and Calculations.

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