Calculate The $\Delta$ G ^$\circ$ 'for the Oxidation of Succinate to Fumarate, a Step in to Fumarate

Essay

Calculate the $\Delta$ G ^$\circ$ 'for the oxidation of succinate to fumarate, a step in the citric acid cycle.
FAD + 2H⁺ + 2e^- $\rarr$ FADH₂ E ^$\circ$ ' = - 0.22 V
fumarate + 2H⁺ + 2e^- $\rarr$ succinate E ^$\circ$ ' = + 0.03 V