Consider oxygen binding to the protein myoglobin and a sample of blood at equilibrium in a closed system at body temperature 37 C.

O_2(aq) + Mb_(aq) MbO₂

Standard entropy of the reaction -133 J.mol^-1 K^-1

Standard enthalpy of the reaction -75 kJ mol^-1

Calculate the equilibrium constant at 37 C.