In the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2, decrease in the pressure of the system will _____________ the degree of dissociation of PCl5?

Question

Accepted Answer

Increase. According to Le Chatelier's principle, decreasing the total pressure shifts the equilibrium towards the side with more moles of gas. Since products (PCl3 + Cl2) have more moles than reactants (PCl5), the shift increases dissociation.