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Question

Using the following data, calculate equilibrium constant K for the reaction
AgCl(s)Ag+(aq)+Cl(aq)
ΔGf(AgCl)=109.7kJ,ΔGf(Ag + )=77.1kJ,
ΔGf(Cl)=131.2kJ,

A
55.6×103
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B
2.95×1041
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C
1.78×1010
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D
9.75
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Solution

The correct option is D 1.78×1010
ΔGreaction=ΔGf(products)ΔGf(reactants)=ΔGf(Ag+)+ΔGf(Cl)ΔGf(AgCl)=77.1+(131.2)(109.7)=55.6kJ
Now, ΔG=ΔG+RTK
For equilibrium, ΔG=0
ΔG=RTKeq55.6×1038.314×298=KeqKeq=e556008.314×298=1.78×1010

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