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For a chemical reaction, the value of ΔG0 is -831.4 J/mol. Then what is the value of KC at 100 k?(a) 1.0077(b) 1.077(c) 1.007(d) 2.7I have been asked this question in unit test.I would like to ask this question from Relationship between Equilibrium Constant K, Reaction Quotient Q and Gibbs Energy G topic in section Equilibrium of Chemistry – Class 11

Answer»

Right answer is (d) 2.7

The explanation is: We know that ΔG0 = – RT lnKc, where ΔG0 is the STANDARD Gibbs free energy, R is UNIVERSAL gas constant, T is the temperature and KC is EQUILIBRIUM constant; substituting ΔG0 as-831.4 J/mol, we get LNK = -831.4J/mol divided by -8.314J mol^–1K^–1 × 100K = 1; lnk = 1; K = e^1 = 2.7


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