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