Can a reaction be both exothermic and nonspontaneous?
$\begingroup$
$\endgroup$
Add a comment
|
$\begingroup$
$\endgroup$
7
The spontaneity of a reaction is given by $\Delta G$
$\Delta G < 0$ = spontaneous reaction
$\Delta G > 0$ = nonspontaneous reaction
$\Delta G$ is quantitatively described by the formula
$$\Delta G = \Delta H - T \Delta S$$
$\Delta H$ is negative (exotermic reaction)
When $T \Delta S$ product is more negative (smaller) than $\Delta H$, we have $\Delta G > 0$ and the reaction is nonspontaneous
-
$\begingroup$ Is there an example of such a reaction though? $\endgroup$ – Safdar Faisal Jul 25 '20 at 14:16
-
$\begingroup$ No, i agree with what you say. However it would be better if you could add an example of such a situation. Also, this would be temperature dependant. You might want to add that/ $\endgroup$ – Safdar Faisal Jul 25 '20 at 14:20
-
$\begingroup$ exothermic non spontaneous not endo thermic $\endgroup$ – Safdar Faisal Jul 25 '20 at 14:25
-
1
-
1$\begingroup$ You can think of any combustion reaction $\endgroup$ – Namburu Karthik Jul 25 '20 at 16:39
