Chemistry- Fundamental ideas 2 0.0 / 5 ? ChemistryUnit 2IGCSEAQA Created by: Splash HeslinCreated on: 17-12-14 16:12 Ar value The mass of an element (the mass number) 1 of 7 Mr value The mass of a compound (the mass numbers added together) 2 of 7 Mole Every substance has the same number of atoms (6.023 x 10 to the 23) per mole, but they weigh different amounts. 3 of 7 Number of moles Mass/ Mr or Ar 4 of 7 % of element in a compound mass of element/ mass of compound x100 5 of 7 Empirical formula The ratio of atoms in a compound. 6 of 7 Finding the % yeild amount of product produced/ maximum amount of product possible x100 7 of 7
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