Chemistry unit 2: calculating percentage mass 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEAQA Created by: starshooter786Created on: 25-04-14 21:22 Formula for percentage mass of an element in a com 1) Ar X no. Of atoms (of that element) / Mr (of the whole compound) X 100 Practical: find the percentage of magnesium In magnesium oxide MGO Ar of magnesium = 24 Ar of oxygen = 16 Mr for MGO = 40 24 x 1 / 40 X 100 = 60% 1 of 1
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