The direct conversion of `A` to `B` is difficult, hence it is carried out as
`A rarr C rarrD rarr B`
Given, `DeltaS_((A^rarrC)) = 50 eU,DeltaS_((C^rarrD))=30eU,DeltaS_((BrarrD))=20 eU`, where `eU` is entropy unit. Thus the change in entropy in `(A rarrB)` is:

Options

A. `+100 eu`
B. `+60 eu`
C. `-100eu`
D. `-60 eu`

Explanation

`DeltaS_((A rarr B)) = DeltaS_((A rarr C)) +DeltaS_((C rarr D)) +DeltaS_((D rarr B))`
`= 50 +30 - 20 = 60 eu`