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In muscle, the enzyme creatine kinase catalyses the following reaction: Equation #1: Phosphocreatine + ADP ⇋ Creatine + ATP Keq = ? The two half-reactions are: Phosphocreatine + H2O -> Creatine + Pi ∆G0’ = -43.1 kJ/mol ATP + H2O -> ADP + Pi ∆G0’ = -30.5 kJ/mol Under standard conditions what is the equilibrium constant (Keq) for the phosphocreatine ⇋ creatine reaction?