For the gas phase reaction, $\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons…
For the gas phase reaction, $\mathrm{PCl}_5(\mathrm{~g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ Which of the following conditions is correct?
$\Delta \mathrm{H} > 0$ and $\Delta \mathrm{S} < 0$
$\Delta \mathrm{H}=0$ and $\Delta \mathrm{S} < 0$
$\Delta \mathrm{H} > 0$ and $\Delta \mathrm{S} > 0$
$\Delta \mathrm{H} < 0$ and $\Delta \mathrm{S} < 0$
Solution
This is an endothermic reaction,
So, $\Delta \mathrm{H} > 0$
Since, number of mole in the product side is more
So $\Delta S > 0$.