This percent composition reference table shows the percent composition for a range of mass of element in compound values, assuming a molar mass of compound of 18 g/mol. Every figure is computed with the same engine that powers our Percent Composition Calculator, so the numbers are exact.
| Mass of element in compound | Percent composition |
|---|---|
| 4 g/mol | 22.22% |
| 8 g/mol | 44.44% |
| 12 g/mol | 66.67% |
| 16 g/mol | 88.89% |
| 24 g/mol | 133.33% |
| 32 g/mol | 177.78% |
| 48 g/mol | 266.67% |
| 80 g/mol | 444.44% |
| 110 g/mol | 611.11% |
| 160 g/mol | 888.89% |
How to use this table
Find the row closest to your mass of element in compound and read across to the percent composition. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Percent Composition Calculator for a precise answer.
Need a value that is not in the table? — the Percent Composition Calculator does it instantly, for free, with the formula and a worked example built in.
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