Formulas for GCSE Chemistry 0.0 / 5 ? ChemistryFormulasGCSEAQA Created by: IiAstroPandaCreated on: 25-05-22 18:39 How do you calculate atom economy? atom economy = (Mr of desired product / Mr of all reactants) x 100 1 of 7 How do you calculate percentage yield? % yield = mass of desired product / mass of all products 2 of 7 What is the formula for calculating moles? Moles = Mass / Mr or Moles = Conc x Vol 3 of 7 How do you calculate volume of a gas? Vol of a Gas = moles x 24000 4 of 7 How do you calculate the Relative Formula Mass of RFM = (Abundance of isotope 1 x Mass of isotope 1) + (Abundance of Isotope 2 x Mass of Isotope 2) 5 of 7 How do you calculate mean rate of reaction? Mean rate of reaction = quantity of reactants used / time taken or quantity of product formed / time taken 6 of 7 How do you calculate Relative Atomic Mass? RAM = (mass 1 x abundance 1) + (mass 2 x abundance 2) + etc then / 100 7 of 7
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