So percentages are how much each element represent of the whole compount by mass. Like H2O for example, has 88.9% oxygen, and 11.1% hydrogen.
Example:
- octane has a molar mass of 114g/mol... 96g/mol is carbon and 18g/mol is hydrogen:
(96/114) x 100% = 84.2% Carbon
(18/114) x 100% = 15.8% Hydrogen
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