Answers

2014-09-24T22:20:08+08:00
Are you talking about percent composition of an element in a given compound?

% composition=(atomic mass of the element/ molecular mass of the compound) x 100
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2014-09-25T21:02:53+08:00
                           mass of the element present in one mole of compound   
Mass percent =                  mass of one mole compound
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