Calculate the standard free energy change for the following reaction.2 Ni2+ (aq) + Fe(s) - Ni(s) +Fe2+ (aq) If E(Ni2+/Ni) = -0.25 V and E(Fe2+/Fe) = -0.44 V (Faraday constant 96,500 J/V.mol) (bo 2.5) X 10% kJ/mol 36.7 - kJ/mol 36.7 - x 103 kJ/mol 36.7 + kJ/mol 36.7 + * The spontaneity of a certain system can be determined by 3 (abo 2.5) a. The value of Gibbs free energy of the universe b. The value of entropy change of the system c. The entropy change of the universe a+b a+c