Percentage Mass Composition This will show how to work out the percentage of a element or compound 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEOCR Created by: Caitlin WardCreated on: 06-10-13 17:56 How to work out % Mass Composition Here is the formula for working out the percentage mass composition: Mass of element / Total mass X 100 = ...% 1 of 3 CuSO4 and NaOH Examples CuSO4 is made up of Cu, S, O4 Cu = 64/160 X 100 = 40% S = 32/160 X 100 = 20% O4 = 64/160 X 100 = 40% NaOH is made up of Na, O, H Na = 23/40 X 100 = 57.5% O = 16/40 X 100 = 40% H = 1/40 X 100 = 2.5% 2 of 3 C6H12O6 Example C6H12O6 is made up of C6, H12, O6 C6 = 72/180 X 100 = 40% H12 = 12/180 X 100 = 6.6% O6 = 96/180 X 100 = 53.3% 3 of 3
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