For the Gas Phase reaction PCl5(g) ----- PCl3(g) + Cl2(g). Which of the following conditions are true?

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For the Gas Phase reaction PCl5(g) ----- PCl3(g) + Cl2(g). Which of the following conditions are true? ​ 13. (3) 93 t (4) -245 For the gas phase reaction. Which of the ate correct ? (l) All O S.S•tO 219

Dear Student,

As the given reaction is the decomposition reaction of $PC{l}_5$ and normally all the decomposition reaction are endothermic which requires energy to break the bond. Hence enthalpy of reaction is positive $\left(∆H\right) > 0 or positive$.

In the given reaction 1 mol of ​$PC{l}_5$ gives the 2 mol of gaseous product. This suggests that there is the increases in the randomness or the entropy of reaction and hence can say that $\left(∆S\right) > 0 or positive$.

So, the correct condition is ΔH>0andΔS>0

Regards.