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Given the thermodynamic data below, determine the equilibrium constant for the following two reactions at 25...

Given the thermodynamic data below, determine the equilibrium constant for the following two reactions at 25 oC. Predict what will happen to ΔG, how the direction of the reaction will shift, and how the spontaneity will be affected when more BaSO4(s) is added to reaction a), and more NH4+(aq) is added to reaction b).

Substance

∆Gof(kJ/mol)

Substance

∆Gof(kJ/mol)

Substance

∆Gof kJ/mol)

BaSO4(s)

–1353.1

SO42–(aq)

–741.99

NH3(aq)

–26.5

Ba2+(aq)

–560.66

OH–(aq)

–157.30

H2O(l)

–237.2

NH4+(aq)

–79.5

a. BaSO4(s) ⇌ Ba2+(aq) + SO42–(aq)

b. NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH–(aq)

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