Metallurgical Engineering > GATE 2022 > Solution
The partial molar enthalpy of Au in Ag-Au melt containing 25 mol% Au at 1400 K is -8300 J⋅mol-1. Assuming regular solution behavior, the activity of Au in the melt is _______ (round off to 3 decimal places).
Given: R=8.314 J⋅K-1⋅mol-1

Correct : 0.125

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