Question

Which of the following reactions will be spontaneous at standard state? Not all the reactions are balanced, so make sure they are balanced first. The ΔG of formation data can be found in an appendix in your text book. You may select multiple answers.

Any reaction with positive a ΔG value for the reaction.

K + H2O(l) = KOH + 1/2H2

S(rhombic) + O2 = SO2

H2(g) + I2(s) = 2HI(g)

Answer 1

Balance the equations.
dGorxn = (n*dGoformation products) - (n*dGo formation reactants)
The rxn is not spontaneous if dGo rxn at std conditions is +.