3-5: Empirical Formula

1. What is the empirical formula for a compound that is 29% Na, 40.5% S and 30.5% O?

2. What is the empirical formula for a compound containing 70% Fe and 30% O?

3. What is the empirical formula of a compound that contains only 43.7 grams N and only 6.3 grams H?

4. What is the empirical formula that is 43.3% sodium, 11.3% carbon, and 45.4% oxygen?

5. What is the empirical formula for a compound that contains only 13.0 grams lead, and only 2.0 grams oxygen?