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If for a certain reaction \Delta _{r}His 30 kJ mol^{-1} at 450 K, the value of \Delta _{r}S (in JK-1 mol -1) for which the same reaction will be spontaneous at the same temperature is

Option: 1

-33
 


Option: 2

33


Option: 3

-70

 


Option: 4

70


Answers (1)

best_answer

For spontaneity,

\Delta G< 0

\Rightarrow \Delta H-T\Delta S\; < 0

\Rightarrow \Delta H-T\Delta S

\Rightarrow \Delta S> \frac{\Delta H}{T}

\Rightarrow \Delta S> \frac{30 \times 10^{3}}{450}> 66.67\; Jk^{-1}mol^{-1}

Hence, the correct answer is option 4.

 

Posted by

Pankaj

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