Here are the answers for the problems assigned for Chapter 7 (Moles and Empirical Formulas).

1. 1.204 x 10¹⁶ atoms of nitrogen
2. 2.59 x 10⁴ grams of aspartame
3. 158.12 grams/mole
4. 1.0 x 10²² atoms of gold
5. C₁₄H₁₈N₂O₅ and C₁₄H₁₈N₂O₅

6. 2.05 x 10²⁰ molecules of aspartame
7. 2.87 x 10²¹ atoms of carbon
8. 87.42% N; 12.58% H
9. 92.26% C in benzene; 14.27% C in ammonium carbide
10. C₁H₂O₁; C₆H₁₂O₆
11. Co₃Mo₂Cl₁₁
12. C₅H₈; C₁₅H₂₄
13. C₃H₂O₂; C₉H₆O₆
14. C₄H₁₀FO₂P; C₄H₁₀FO₂P
15. Fe₂S₃
16. C₈H₁₆O₈