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Chemical Engineering Basics - Engineering

Q1:

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is

A R ln 2

B -R ln 2

C 3 R ln 2

D -3R ln 2

ANS:A - R ln 2

We know entropy of mixing= - total moles(-R * summation(Xi*ln(Xi))).
= - 1*(R*(0.5*ln(0.5)+0.5*ln(0.5))),
= -1*(R*2*0.5*ln(0.5)),
=-R*ln*(0.5),
= R*ln*(2).
So option A is correct one.