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Moles

The Percentage of an Element in a Compound.

Example 1.

What is the percentage of Carbon in Propene?

Formula of propene is C₃H₆.  RAM of  C = 12,  RAM of  H = 1.

Method.
The RFM of propene is (3 x 12) + (6 x 1),
=  36 + 6
=  42.     

36 of the 42 is due to carbon,
so the percentage of carbon in the compound is
(36 ÷ 42) x 100
= 85·7%.

Answer.  Carbon makes up 85·7% of propene.

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