Moles and gas volumes 0.0 / 5 ? ChemistryAtoms and reactions.ASOCR Created by: racheonCreated on: 22-02-14 19:09 Define molar volume. The volume per mole of a gas. The units of it are dm^3 mol^-1. At room temperature and pressure it's approximately 24 dm^3 mol^-1. 1 of 12 What do equal volumes of gases at the same temperature and pressure contain? Equal numbers of molecules, it doesn't matter which type of gas is being measured. 2 of 12 By measuring the volume of any gas what are you indirectly counting? The number of molecules. 3 of 12 At room temperature and pressure how much does 1 mole of gas molecules occupy? 24 dm^3 or 24 dm^3 mol-1 volume. 4 of 12 At room temperature and pressure what is 1 mole of H2, O2 and CO2 molar volume? 24 dm^3 mol^-1. 5 of 12 What does 1 mol of H2 weigh? 2g. 6 of 12 What does 1 mole of O2 weigh? 32g. 7 of 12 What does 1 mole of CO2 weigh? 44g. 8 of 12 If volume is in dm^3 how do you work out how many moles there are? n=V/24. 9 of 12 If volume is in cm^3 how do you work out how many moles there are? n=V/24,000. 10 of 12 What amount, in mol, of gas molecules is in 72cm^3 of any gas at room temperature and pressure? n=V/24,000=72/24,000=0.003 mol. 11 of 12 What is the volume, in cm^3, of 2.13x10^-3 mole of a gas at room temperature and pressure. n=V/24,000. Hence, V=nx24,000=2.13x10^-3x24,000=51.12cm^3. 12 of 12
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