2 NaOH (aq) + 1 (NH4)2SO4 (s) → Na2SO4 (aq) + 2 H2O (ℓ) + 2 NH3 (g)

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Reaction Type:

Double Displacement/Decomposition of Ammonium Hydroxide

Stoichiometry

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NaOH           Mass: g  or Solution Volume: mL of Concentration: mol/L
(NH4)2SO4      Mass: g
Na2SO4         Mass: g  or Solution Volume: mL of Concentration: mol/L
H2O            Mass: g
NH3            Mass: g  or Gas Volume: L

Enthalpy of Reaction

[1ΔHf(Na2SO4 (aq)) + 2ΔHf(H2O (ℓ)) + 2ΔHf(NH3 (g))] - [2ΔHf(NaOH (aq)) + 1ΔHf((NH4)2SO4 (s))]
[1(-1389.47) + 2(-285.83) + 2(-46.11)] - [2(-470.09) + 1(-1180.85)] = 67.6799999999998 kJ
67.68 kJ     (endothermic)

Free Energy of Reaction (at 298.15 K)

From ΔGf° values:
[1ΔGf(Na2SO4 (aq)) + 2ΔGf(H2O (ℓ)) + 2ΔGf(NH3 (g))] - [2ΔGf(NaOH (aq)) + 1ΔGf((NH4)2SO4 (s))]
[1(-1268.43) + 2(-237.18) + 2(-16.48)] - [2(-419.18) + 1(-901.9)] = -35.4900000000002 kJ
-35.49 kJ     (spontaneous)

From ΔG = ΔH - TΔS:
-35.48 kJ     (spontaneous)

Equilibrium Constant, K (at 298.15 K)

1651676.40166425
This process is favorable at 25°C.