The conversion A to B is carried out by the following path : `{:(C rarr D),(uarr" "darr),("A B"):}` Given : `Delta S_((A rarr C))=50` e.u. ,
`Delta S_((C rarr D))=30` e.u., `Delta S_((B rarr D))=20` e.u.
where w.u. is entropy unit then `Delta S_((A rarr B))` is

Options

A. `+100` e.u.
B. `+60` e.u.
C. `-100` e.u.
D. `-60` e.u.

Answer

B

Explanation

`Delta S_((A rarr B))=Delta S_((A rarr C))+Delta S_((C rarr D))-Delta S_((B rarr D))`
`= 50+30-20 = 60` e.u.