What mass of sodium carbonate is required for complete reaction with 8.35 g of nitric acid to produce sodium nitrate, carbon dioxide, and water? (m.m. of HNO3 = 63 g/mol., Na2CO3 = 106 g/mol) Answer: 7.02 g Na2CO3 + 2HNO3 2NaNO3 + H2O + CO2 (g)