The standard free-energy changes for the reactions below are given. phosphocreatine → creatine + Pi Δ G'° = -43.0 kJ/mol ATP → ADP + Pi Δ G'° = -30.5 kJ/mol What is the overall Δ G'° for the following reaction? Phosphocreatine + ADP → creatine + ATP
A) -73.5 kJ/mol B) -12.5 kJ/mol C) +12.5 kJ/mol D) +73.5 kJ/mol E) Δ G'° cannot be calculated without Keq'.