Solving for a reactant using a chemical equation

Question

Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia. What mass of ammonium phosphate is produced by the reaction of 8.00 g of ammonia? Round your answer to 3 significant figures.

Answer 1

Ammonium phosphate = (NH4)3PO4

Phosphoric acid = H3PO4

Ammonia = NH3

Write the correctly balanced equation:

H₃PO₄ + 3NH₃ ==> (NH₄)₃PO₄

Assuming H3PO4 is present in excess, we can use the mols of NH3 present to determine the theoretical yield of (NH₄)₃PO₄

8.00 g NH₃ x 1 mol NH₃ / 17 g x 1 mol (NH₄)₃PO₄ / 3 mol NH₃ x 149 g (NH₄)₃PO₄ / mol =

23.4 g (NH₄)₃PO₄