# exp_lighter_gas_ver05.pdf - page 1 of 2 preIBch The Molar...

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page 1 of 2 preIBch The Molar Mass of Lighter Gas The molar mass of lighter gas will be determined by measuring the volume, temperature and pressure of the gas in order to calculate the amount of substance using the ideal gas law. The mass of the gas is determined by weighing the lighter before and after the gas is released. The molar mass, M , can then be calculated. Theory If the molecules of a gas occupy negligible volume and exert negligible forces on one another, then the gas is referred to as an ideal gas. At low pressure and high temperature, real gases follow the ideal gas equation: 𝑝 𝑉 = ? 𝑅 𝑇 Where 𝑝 is the pressure (in kPa), 𝑉 is the volume (in dm 3 ), ? is the amount of substance (in mol), 𝑇 is the absolute temperature (in K) and 𝑅 is the universal gas constant, 8.31 J K −1 mol −1 . Apparatus 250 cm 3 or 500 cm 3 graduated cylinder, large container with water, thermometer, paper towels, disposable lighter, balance, barometer Procedure 1. Weigh the lighter to the precision of the balance and record its mass, ?