Chemistry unit 2: calculating percentage mass

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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%

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