Chemical Calculations - definitions 0.0 / 5 ? ChemistryCalculationsASWJEC Created by: Sophia DowdenCreated on: 17-03-16 10:14 Relative Atomic Mass The average mass of an ATOM compared to 1/12 the mass of an atom of 12C. 1 of 10 Relative Isotopic Mass The mass of an ATOM compared to 1/12 the mass of an atom of 12C. 2 of 10 Relative molecular mass The AVERAGE mass of a MOLECULE compared to 1/12 the mass of an atom of 12C. 3 of 10 Relative Formula Mass The AVERAGE mass of ONE FORMULA UNIT compared to 1/12 the mass of an atom of C12. 4 of 10 Mole A mole is the amount of a substance that contains the same number of particles as there are atoms of carbon in exactly 12g of 12C. 5 of 10 Empirical Formula The simplest whole number ratio of atoms (or ions) present in a compound. 6 of 10 Molecular Formula The actual number of atoms present in a compound. 7 of 10 Calculations Involving Gas Volumes At room temperature and pressure (r.t.p), one mole of any gas occupies 24dm3 of space. 8 of 10 % Yield The actual mass obtained/the theoretical mass possible X 100 9 of 10 Atom Economy The formula mass of desired products/total formula masses of reactants X 100 10 of 10

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