Printable Empirical Formula Worksheet
This worksheet is for chemistry students who are practicing empirical formula from percent composition. It has Name and Date fields and two pages of problems. The sheet tells students to assume 100 g and find the empirical formula. The practice set is arranged in two columns with problems and answer spaces. Problems include compositions such as 75.0% C and 25.0% H, 40.0% C, 6.7% H, 53.3% O, 27.3% C and 72.7% O, 52.9% Al and 47.1% O, 85.6% C and 14.4% H, and 43.4% Na, 11.3% C, 45.3% O.
Free printable · PDF
- 2 pages
- US Letter — choose “Fit to page” for A4
- PDF, 54 KB
Free for personal, family and classroom use.
Use the first page for classwork or homework and the second page for checking answers. Students convert each percent to grams, find moles, and reduce to the simplest whole-number ratio. The answer key lists each problem with its empirical formula, including CH4, CH2O, CO2, Al2O3, and Na2CO3.
Good for
- Class practice on percent composition
- Homework for empirical formula problems
- Quick review before a chemistry quiz
Tip: Print double-sided so the answer key stays with the practice page.
4 files · PDF, DOCX, XLSX
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