Determine the number of moles NH41 + in 3 moles of (NH4) 3PO4.

(NH₄) ₃PO₄ is a strong electrolyte which fully dissociates into its ions. The balanced equation for the dissociation is

(NH₄) ₃PO₄ → 3NH₄⁺ + PO₄³⁻

The stoichiometric ratio between (NH₄) ₃PO₄ and NH₄⁺ is 1 : 3

Hence, moles of (NH₄) ₃PO₄ / moles of NH₄⁺ = 1 / 3

moles of (NH₄) ₃PO₄ = 3 mol

Hence, moles of NH₄⁺ = moles of (NH₄) ₃PO₄ x 3

= 3 mol x 3

= 9 mol

Hence, 3 moles of (NH₄) ₃PO₄ give 9 moles of NH₄⁺.