Answer to Question #168597 in Material Science Engineering for Abed

Question #168597

By using the following data only,evaluate pH2S/pH2 in equilibrium with Ag and a maHe conting 90 mol% Ag2s at 600c .Assume the gases are ideal and enthalpies are independent of temprature

4Ag(s)+S2(g)___ 2Ag2S(s) G873°=30,750 cal


H2(g) S2 H2S cal/k.mol

S298° 31.21 54.4 49.1


Hf298° 0 31,000 4800 cal/mol


1
Expert's answer
2021-03-05T02:53:03-0500

It was found that the sulfur activities for the equilibrium Ag (s)-Ag2S (s) were in good agreement with those reported by other investigators using the E.M.F. method with different electrolytes. The eutectic and the monotectic temperature estimated by the present activity measurements were found in good agreement with results of earlier works. The boundary of the miscibility gap in the liquid state, however, was found to extend a little wider in the low sulfur content region than that reported in the literature. The thermodynamic functions of liquid Ag-S solution were determined from the present results. These functions show that this solution behaves like a solution associated with the complex Ag2S.


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