2. The dependence of the partial molar heat and entropy of dissolution of magnesium in liquid Mg-Al solutions on the composition is described by the equations:
ΔHMg=-15100*X2Mg, J/mol:
ΔSMg=-R*lnMg-5.58*XAl, J/(mol*K).
Determine the activity of aMg and the activity coefficient of yMg at 1000 K in a solution containing 30 wt. % Al.

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