Moles

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1.27 - What is a mole
1.30 Calculating percentage yield 
1.32 - What are empirical and molecular formulae 
1.33 - Calculate empirical and molecular formulae from experimental data 
1.35 - Calculations involving gas volumes and molar volume of gas

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1.25 Be able to write word equations and balanced chemical equations

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At standard temperature and pressure, one mole of any gas will occupy 24000 cm3; also known as 24dm3. Calculating molar volume from mass Example: 976 cm 3 of oxygen was found to have a mass of 1.3 g Calculate the molar volume of oxygen, under these conditions. Volume = mass x no. of moles Mass of oxygen, O 2 , = 32.0 g. Volume of 1 g = 976 ÷ 1.3 Hence, 32 g = (976 ÷ 1.3) × 32 = 24024 cm 3 Answer: 24.0 is the volume of 32.0 g of O 2 .
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