The free energy, heat, and entropy of formation of l-malic acid

In the previous communication (1), it was shown that the free energy of the bivalent fumarate ion at 25° is -144,630 calories. In the present communication the measurement of the equilibrium at 25° between fumaric acid and malic acid in the presence of fumarase is reported, and from the values obtained computations are made of the free energy and heat of formation of the bivalent l-malate ion and of the free energy and entropy of solid l-malic acid.