Question

The direct conversion of A to B is difficult, hence it is carried out by the following shown path 

Given that ∆S_(A→C) = 50 eu

∆S _(C→D) = 30 eu

∆S _(D→B) = 20 eu 

Where eu is entropy unit. Then ∆S_(A→B) is 

(A) +100 eu 

(B) +60 eu 

(C) -100 eu 

(D) -60 eu 

Answer 1

Correct option (B) +60 eu

Explanation:

Entropy is a state function hence:

∆S_A→B = ∆_A→C +∆_A→D +∆S_D→B

= 50 eu + 30 eu + (–20 eu) = 60 eu