Answer to Question #168597 in Material Science Engineering for Abed

Question

By using the following data only,evaluate pH2S/p_{H2 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)+S_{2(g)___} 2Ag₂S_(s) G_873°=30,750 cal

H_2(g) S₂ H2S cal/k.mol

S₂₉₈^° 31.21 54.4 49.1

H_f^298° 0 31,000 4800 cal/mol

Answer 1

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.