What is the percentage of carbon in carbon dioxide, C02?
Ar of C = 12, 0 = 16
Mr of C02 = 12 + (16x2) = 44
12/44 x 100 = 27.3%
The empirical formula is the simplest ratio of atoms in a compound. (It is not always the same as the molecular formula).
What is the empirical formula of the hydrocarbon that contains 80% carbon?
1) Mass in 100g of compund - Carbon = 80g, Hydrogen = 20g
2) Mass/Ar - 80/12 = 6.67, 20/1 = 20
3) Divide by smallest number - 6.67/6.67 = 1, 20/6.67 = 3
4) Ratio - 1:3
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