Empirical Formulas
Find the empirical formula for each
of the following substances. The percent
composition is given.
1.
88.8 % copper & 11.2 % oxygen
2. 10.04 % carbon,
0.84 % hydrogen, & 89.12 % chlorine
3. 42.50 % chromium
& 57.50 % chlorine
4.
38.67 % potassium, 13.85 % nitrogen, & 47.48 % oxygen
5. 72.40 % iron
& 27.60 % oxygen
Part 2 – Determine the empirical
formula of the following compounds using the given data.
6.
Find the empirical formula for sodium sulfite. Sodium sulfite contains 36.5 % sodium,
25.4 % sulfur, and 38.1 % oxygen.
7. What is the empirical formula for a
compound which contains 53.73 % iron and 46.27 %
sulfur?
8. What is the empirical formula of a
compound if the percentage composition is:
aluminum 15.77 %, sulfur 28.11 %,
and oxygen 56.12 %?
9. If 8.87 grams of phosphorus react with 11.43 grams of oxygen, what is
the empirical
formula of the compound formed?
10. Phosgene, a poisonous gas
used during World War I, contains 12.1 % C, 16.2 % O, and
71.7% Cl. What is the empirical formula for phosgene?