Chemical Engineering > GATE 2012 > Phase Equilibria
Consider a binary liquid mixture at constant temperature T and pressure P. If the enthalpy change of mixing, ΔH=5x1x2, where x1 and x2 are the mole fraction of species 1 and 2 respectively, and the entropy change of mixing ΔS=-R[x1ln x1+x2ln x2] (with R=8.314 J/mol.K), then the minimum value of the Gibbs free energy change of mixing at 300 K occurs when
A
x1=0
B
x1=0.2
C
x1=0.4
D
x1=0.5

Correct : d

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Gibbs free energy change of mixing chemical engineering gate 2012 entropy change of mixing enthalpy change of mixing mole fraction Gibbs free energy minimum chemical engineering thermodynamics entropy mixing formula GATE chemical engineering 2012

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