Question

For the gas phase reaction, PCl5(g) ⇋ PCl3(g) + Cl2(g)

Answer 1

Answer is - (d) ΔH > 0 and ΔS > 0.

Answer 2

Answer:

Explanation:

The correct option is : (d) ΔH > 0 and ΔS > 0

Explanation:

Gas phase reaction

PCl5(g) ⇋ PCl3(g) + Cl2(g)  

ΔH = ΔE + Δng RT

Δng = Change in number of moles of product and reactant species.

Since  Δng = +ve, hence ΔH = +ve

also one mole of PCl5 is dissociated into two moles of PCl5 and Cl2 in the same phase.

Therefore, ΔS = Sproduct - Sreactant

ΔS = +ve