H2(g) + I2(s) ⟶ 2HI(g)
We can use the following equation to solve for ΔG˚rxn:
The values for ΔG˚f can be looked up in textbooks or online:
ΔG˚f, H2(g) = 0 kJ/mol
ΔG˚f, I2(s) = 0 kJ/mol
ΔG˚f, HI(g) = 1.72 kJ/mol
Note that we need to multiply each ΔG˚f by the stoichiometric coefficient since ΔG˚f is in kJ/mol.
Calculate ΔG° for the reaction using ΔG°f value: H2(g) + I2(s) ⟶ 2HI(g)
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