1. a. LiOH: 23.95 g/mol
b. BaBr₂: 297.14 g/mol
c. Mg(C₂H₃O₂)₂: 142.39 g/mol
d. Ca(NO₃)₂: 164.09 g/mol
2. 1.69 × 10²⁴ molecules CH₄
3. 0.470 mol NaOH
4. 1.59 mol NaCl
5. 8.34 × 10²⁴ f.u. CaCO₃ (mass = 138.5 g)
6. a. 1.7 × 10²³ atoms Ni
b. 1.11 × 10²⁴ atoms S
c. 7.95 × 10²³ molecules F₂
d. 1.90 × 10²⁴ formula units K₃PO₄
7. 32.5 L O₂
8. 12.6 g NH₃
9. 1.05 × 10²⁵ total atoms
10. a. Fe₂O₃: Fe = 69.94%, O = 30.06%
b. Ca₃(PO₄)₂: Ca = 38.76%, P = 19.97%, O = 41.27%
c. CH₄: C = 74.87%, H = 25.13%
d. H₂SO₄: H = 2.06%, S = 32.69%, O = 65.25%
11. Empirical formula: C₉H₁₃NO₃; Molecular formula: C₉H₁₃NO₃
12. Empirical formula: Mg₃N₂
13. Empirical formula: C₅H₇N; Molecular formula: C₁₀H₁₄N₂
14. 3.54 × 10²² total ions
Parent Tip: Review the logic above to help your child master the concept of molecular mass and mole calculations worksheet answers.
