13. What is the molar mass of (NH4) 3PO4? (Use whole number molar masses) *
a. 113 g
b. 121 g
c. 149 g
d. 339 g
14. What is the mass of oxygen in 300 g of sulfuric acid (H2SO4) ? *
a. 64 g
b. 196 g
c. 210 g
d. 300 g
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