The initial CO2 volumes yielding selected oxygen fugacities at specified temperatures have been computed for H2-CO2 gas mixtures at one atmosphere total pressure. The calculations are based on the thermochemical data of the JANAF Tables for the species CO2-H2-H2O-CO-O2-CH4 and are carried out using the Newton-Raphson method of successive approximation. The new values replace older ones where the effects of CH4 in the system were treated only in an approximate manner.

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