Problem: What is the free energy change, ∆G°, for the equilibrium between hydrogen iodide, hydrogen, and iodine at 726K? Kc = 0.020 2HI(g) ⇌ H2(g) + I2(g)A) 6.4 kJB) 8.8 kJC) 15 kJD) 19 kJE) 24 kJ

FREE Expert Solution

We’re being asked to determine the free energy change, ∆G° at 726 K for the given reaction:


2HI(g) ⇌ H2(g) + I2(g)


Recall that ΔG˚rxn and K are related to each other:


ΔG°rxn=-RTlnK



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Problem Details

What is the free energy change, ∆G°, for the equilibrium between hydrogen iodide, hydrogen, and iodine at 726K? Kc = 0.020 

2HI(g) ⇌ H2(g) + I2(g)

A) 6.4 kJ

B) 8.8 kJ

C) 15 kJ

D) 19 kJ

E) 24 kJ