14. a. i, ii, iv, vi
b. iii, v
15. Chemical formulas provide different chemical substances and elements that are present in a formula.
16. a. 3 Hydrogen atoms, 1 Phosphorus atom, and 4 Oxygen atoms
b. 1 Sodium atom, 1 Oxygen atom, and 1 Hydrogen atom
c. 1 Sulfer atom, and 2 Oxygen atoms
17.
18. a. Na^9 HCO^3 + H Cl → NaCl + H^2 O + CO^2
b. C^6 H^12 0^6 + O^6 → CO^6 3 H^2 O
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