AQA•A-Level•Chemistry
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Amount of Substance
Moles, Avogadro, molar mass, empirical and molecular formulae, and gas calculations
Practice 27 subtopics in Amount of Substance. All questions match the AQA A-Level specification.
About Amount of Substance
Amount of Substance is a key topic in the AQA A-Level Chemistryspecification. This topic covers moles, avogadro, molar mass, empirical and molecular formulae, and gas calculations.
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The mole and Avogadro constantMolar mass and relative molecular massCalculating moles from mass: n = m/MCalculating mass from molesMolar volume of a gas at RTP (24 dm³)Molar volume at STPCalculating volume of gas from molesCalculating moles from gas volumeIdeal gas equation: pV = nRTConcentration in mol dm⁻³Concentration in g dm⁻³Converting between concentration unitsDilution calculationsEmpirical formula from percentage compositionEmpirical formula from combustion dataMolecular formula from empirical formulaWater of crystallisation calculationsBalanced equations and stoichiometryReacting mass calculationsLimiting reagent calculationsPercentage yield calculationsAtom economy calculationsPercentage yield vs atom economyAcid-base titration calculationsStandard solutionsTitration with indicatorsBack titration calculations
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