431.    ---------------.  Methane Equilibrium.  IV.  Jour. Phys. Chem., vol. 31, 1927, pp. 417-418; Chem. Abs., vol. 21, 1927, p. 2213.

                  Free energy of formation of CH₄ from H₂ and amorphous C is calculated as ∆ F=-19,280+10.67 TinT –0.00786T²-0.0-6T³-42.2T, from which ∆ F=-14,500.