Row NH4+: NH4NO3, (NH4)2SO4, (NH4)3PO4. Row Li+: LiNO3, Li2SO4, Li3PO4. Row Al3+: Al(NO3)3, Al2(SO4)3, AlPO4. Row Cu2+: Cu(NO3)2, CuSO4, Cu3(PO4)2. Each entry balances the positive and negative charges of the combining ions.
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The calculated formula unit masses are 80 u for ammonium nitrate NH4NO3, 98 u for phosphoric acid H3PO4 and 84 u for sodium hydrogencarbonate NaHCO3, found by adding the individual atomic masses.