Question

The direct conversion of A to B is difficult, hence it is carried out by the following shown path :
Given
$\Delta S_{(A \rightarrow C)}$ = 50 e.u. , $\Delta S_{(C \rightarrow D)}$ = 30 e.u. , $\Delta S_{(B \rightarrow D)}$ = 20 e.u. , where e.u. is the entropy unit, then $\Delta S_{(A \rightarrow B)}$ is
(a) +60 e.u.
(b) +100 e.u.
(c) –60 e.u.
(d) –100 e.u.

Answer 1

50-30+20=40

This is the exact answer