When a balanced chemical equation is written in the opposite direction, how do the standard Gibbs free energy change, ΔG∘, and the equilibrium constant, K, for the reaction change?
a) ΔG∘ remains the same sign, and K is inverted.
b) ΔG∘ changes sign, and K remains unchanged.
c) ΔG∘ changes sign, and K is inverted.
d) ΔG∘ changes sign, and K is squared.