Thermodynamics and Thermochemistry - Result Question 104

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

Given that $\quad \Delta S _{(A \rightarrow C)}=50 eu$

$\Delta S _{(C \rightarrow D)}=30 eu$

$\Delta S _{(D \rightarrow B)}=-20$ euwhere, eu is entropy unit

Then, $\Delta S _{(A \rightarrow B)}$ is

(2006, 3M)

(a) +100 eu

(b) +60 eu

(c) -100 eu

(d) -60 eu

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Solution:

  1. Entropy is a state function hence,

$$ \begin{aligned} \Delta S _{A \rightarrow B} & =\Delta S _{A \rightarrow C}+\Delta S _{C \rightarrow D}+\Delta S _{D \rightarrow B} \ & =50 eu+30 eu+(-20 eu) \ & =60 eu \end{aligned} $$



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