Chemistry AS 0.0 / 5 ? ChemistryAtomic MassesA2/A-levelOCR Created by: Christiana LiuCreated on: 08-04-15 00:25 Relative Isotopic Mass The mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12 1 of 7 Relative Atomic Mass The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom of carbon-12 2 of 7 Relative Molecular Mass The weighted mean mass of a molecule compared with 1/12th of the mass of an atom of carbon-12 3 of 7 Mole Amount of substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope 4 of 7 Avogardo Constant The number of atoms per mole of the carbon-12 isotope (6.02x10^23 mol-1) 5 of 7 Salt Chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another positive ion such as NH4+ 6 of 7 Water of Crystallisation The water molecules that form an essential part of the crystalline structure of a compound 7 of 7
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