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Question

For a reaction: $$ X \rightarrow Y + Z$$ 
Absolute entropies of X,Y,Z are 120 J $$K^{-1} \ mol^{-1}$$ ,213.8 J$$K^{-1} \ mol^{-1}$$ and 197.9 J $$K^{-1} \ mol^{-1}$$ respectively.
What will be the entropy change of the reaction at 298 K and 1 atm ?


A
291.7 J K1
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B
255 J K1
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C
213.8 J K1
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D
257.3 J K1
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Solution

The correct option is A 291.7 J $$K^{-1}$$
$$\Delta S^0 = \sum S_P^0 - \sum S_R^0$$ 

         $$ =(213.8 + 197.9) - 120$$ 

       $$   = 291.7\ JK^{-1}$$

Hence, the correct answer is option $$\text{A}$$.

Chemistry

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