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The direct conversion of A to B is diffi...

The direct conversion of `A` to `B` is difficult hence it is carried out by the following shown path `underset(A)underset(uarr)(C)rarrDunderset(B)underset(darr)`
Given,
`DeltaS_((A rarr C)) = 50 eu`
`DeltaS_((C rarr D)) =30 eu`
`DeltaS_((B rarr D)) = 20 eu`
where eu is the entropy unit, then `DeltaS_((A rarr B))` is

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