Foundation Chemistry Definitions 0.0 / 5 ? ChemistryAtoms and MolesA2/A-levelOCR Created by: That Vet StudentCreated on: 10-10-20 14:48 Relative Atomic Mass (Ar) The average mass of atoms of an element relative to 1/12th of the mass of an atom of carbon 12. 1 of 9 Relative Isotopic Mass The average mass of an isotope of an element relative to 1/12th of the mass of an atom of carbon 12. 2 of 9 Mole One mole is the amount of substance that contains as many particles as there are in exactly 12g of carbon 12. 3 of 9 Empirical Formula Simplest whole number ratio of atoms of each element in a compound. 4 of 9 Molecular Formula Number of atoms of each element in a molecule. 5 of 9 Stoichiometry Tells you the relative number of moles of reactants and products involved in a reaction. 6 of 9 Percentage Yield Measure of the success of a laboratory preparation. 7 of 9 Theoretical Yield The number of moles expected if the reactants were completely converted into products. 8 of 9 Actual Yield The actual number of moles of product formed in the reaction. 9 of 9
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