How many moles of sodium phosphate would be required to react with 1.0 mol of silver nitrate?

The reaction equation:
Na₃PO₄ + 3AgNO₃ → 3NaNO₃ + Ag₃PO₄

From the equation, we can see that:
1 mole of sodium phosphate requires 3 moles of silver nitrate. So one mole of silver nitrate will require:
1/3 moles of sodium phosphate.