Experiments are described in which the distribution of deuterium between hydrogen and water vapor at equilibrium at 800deg;K is investigated. The equilibrium constants of the reactions necessary to describe the system H2, HD, D2, H2O, HDO and D2O are calculated and the amount of each constituent calculated for various concentrations of deuterium. The distribution of deuterium between the hydrogen and the water is calculated and found to agree with the experimental data.
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