Measurements have been made of the equilibria between H2 + H2S + Cu + Cu2S aiid Hz + H2S + Cu + (Cu2S + Na2S) in the temperature range 527" C to 1152" C.The results have been used for calculation of the thermodynamic properties of solid Cu2S and the activities of Cu2S in both solid and liquid solutions containing up to 37 mole % Na2S. The partial molar heats and entropies of solution of Cu2S in the
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