834.    ---------------.  [EMMETT, P. H., AND SCHULTZ, J. F.]  Equilibria in the Iron-Hydrogen-Oxygen System.  Indirect Calculation of the Water-Gas Equilibrium Constant.  Jour. Am. Chem. Soc., vol. 52, 1930, p. 4268-4285; Chem. Abs., vol. 25, 1931, p. 453.

      The equilibrium constant K=PH2O/PH2 for the reaction FeO+H2=Fe+H2O was determined by a flow method.  At 600, 700, 800, 900, and 1,000, K is, respectively, 0.332, 0.422, 0.499, 0.594, and 0.669.  For the reaction Fe3O4+H2=3FeO+H2O, K is 1.18 at 700 and 2.37 at 800.  The water-gas constants, calculated by combining these Fe-H-O equilibrium values with those for the Fe-C-O system, agree excellently with constants measured directly by Neumann and Kohler.