We already have our balanced equation, so let's do mole to mole ratios

(a) How many moles of Na₃PO₄ would be required to react with 1.0 mole of AgNO₃

1.0 mole of AgNO₃ 

(1 Na₃PO₄) / (3 mole of AgNO₃)

  = 0.3 moles Na₃PO₄

0.3 moles Na₃PO₄ are required to react with 1.0 mole of AgNO₃



(b) How many moles of NaNO₃ can be produced from 0.50 mole of Na₃PO₄?

0.50 mole Na₃PO₄ 

(3 moles NaNO₃) / (1 mole Na₃PO₄)

  = 1.5 moles of NaNO₃

1.5 moles of NaNO₃can be produced from 0.50 moles Na₃PO₄



(c) How many moles of Ag₃PO₄ can be produced from 5.00 moles of Na₃PO₄?

5.00 moles Na₃PO₄ 

(1 mole Ag₃PO₄) / (1 mole Na₃PO)

  = 5.00 moles Ag₃PO₄

5.00 moles Ag₃PO₄ can be produced from 5.00 moles Na₃PO₄



(d) If you have 3.5 moles of Na₃PO₄, how many moles of AgNO₃ will be needed for a complete reaction?

3.5 moles Na₃PO₄ 

(3 moles AgNO₃) / (1 Na₃PO₄)

  = 10.5 moles AgNO₃

11. moles AgNO₃ are needed to complete the reaction