Module 2 Chemistry Definition 0.0 / 5 ? ChemistryModule 2 definitionsA2/A-levelOCR Created by: EmmaCreated on: 01-07-17 08:59 Isotope Atoms of the same element with different numbers of neutrons and different masses but the same number of protons (atomic number). 1 of 10 Relative Atomic Mass The weighted mean mass of an atom of an element compared to 1/12th the mass of an atom of carbon-12. 2 of 10 Relative Isotopic Mass The mass of an atom of an isotope compared to 1/12th the mass of an atom of carbon-12. 3 of 10 Relative Molecular/Formula Mass The average mass of a molecule or a formula unit, compared to 1/12th the mass of an atom of carbon-12. 4 of 10 Relative Isotopic Abundance The percentage of a particular isotope of an element. 5 of 10 Amount of Substance The quantity whose unit is the mole, used as a means of counting any species such as atoms, ions and molecules 6 of 10 Mole The amount of any substance containing as many elementary particles as there are carbon atoms in exactly 12g of the carbon-12 isotope (6.02 x 10^23 7 of 10 Avogadro constant (Na) The number of particles per mole of the carbon-12 isotope (6.02 x 10^23 mol-1) 8 of 10 Molar Mass (M) The mass per mole of a substance, in units of g mol-1. 9 of 10 Molar Gas Volume (Vm) The volume per mole of gas molecules at a stated temperature and pressure. 10 of 10
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