Chemistry C2 - Two Formula Mass Calculations

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CALCULATING % MASS OF AN ELEMENT IN A COMPOUND 

Percentage mass of an element in a compound = 

Ar X No. atoms (of that element) divided by Mr (of whole compound) X 100 

Example: find the percentage mass of sodium in sodium carbonate Na2CO3 

Ar of sodium = 23 Ar of Carbon = 12 Ar of oxygen = 16 

Mr of

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