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A2 The Gibbs free energy of formation, AGM, of liquid Sn-Cu alloys at 1400 K, as a function of composition, are listed below. From these data, plot the composition dependencies of the activity of Sn (asn) and Cu (acu). Xsn 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 AGM 0 -8,042 -11,860 -13,370 -13,810 -13,250 -12,090 -10,390 -8,104 -5,004 0 J/mol m m dG Hint: Use GB - G + XA DXB for A GSA ,AGRO m Then use exP (AGSM / RT)