441E2||Q4|5

The Gibbs energy of formation of any chemical element in its reference state is

Absolute value of the Galvani potential difference (electrical potential difference between two phases)

When temperature increases, the standard OCP of a H /O fuel cell

If one uses data of Chapter 10: Data Section, it can be found that when temperature increases, the standard Gibbs energy a C(s)/O (g) fuel cell reaction

If a fuel cell reaction is (1/2) CH4 (g) + O2 (g) = (1/2) CO2 (g) + H2O(g), the standard Gibbs energy of the reaction is defined as

The precise relationship between Gibbs energy (Δ G), enthalpy (Δ H), and entropy (Δ S) of a chemical reaction at temperature T is