3394. THOMPSON, M. DEK. Specific-Heat Equations for Carbon Dioxide, Carbon Monoxide, Steam, Hydrogen and Oxygen, and the Free-Energy Equation for the Water-Gas Reaction. Trans. Electrochem. Soc., vol. 82, 1942, pp. 397-402; Chem. Abs., vol. 36, 1942, p. 6388. Least-square solutions for the specific-heat equations of the above gases are worked out for the forms C(p)=a+bT+cT^{2}, C(p)=a+bT+cT^{-2}, and C(p)=a+bT+cT^{-1/2}, and the sums of the squares of the deviations of C(p), Σ dev.^{2}, calculated by each equation, from the experimental values are compared. The equation giving the smallest Σ dev.^{2} being the best, it is found that, for the temperature range 300°-3,000° or 3,500° K., the T^{2} equation is the best for CO and steam, the T^{-2} equation is the best for H_{2}, and the T^{-1/2} equation is the best for CO_{2} and for O_{2}. The equation for ∆ G° of the water-gas reaction is then computed, and the values of log K computed by this equation are compared with the values obtained directly from spectroscopic observations. THOMPSON, O. F. See abs. 451, 452, 453. |