Configurational entropy due to ideal mixing in a binary A - B system is expressed as:
ΔSmix = - R(XA In XA + XB In XB),
where XA and XB are mole fractions of A and B respectively.
ΔSmix is maximum at XA = . . . . . . . .
A. 0.1
B. 0.2
C. 0.5
D. 0.9
Answer: Option C
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