When PCl5 is heated it gasifies and dissociates into PCl3 and Cl2 . The density of the gas mixture at 200°C is 70.2 . What is the degree of dissociation of PCl5 at 200°C .

Question

When PCl5 is heated it gasifies and dissociates into PCl3 and Cl2 . The density of the gas mixture at 200°C is 70.2 . What is the degree of dissociation of PCl5 at 200°C . (A)  0.485  (B)  0.242  (C)  0.845  (D)  0.542

Tardigrade Admin · Accepted Answer

PCl6(g) arrow PCl3(g) + Cl2(g) The initial vapour density will be same, it would be MPCl5/2 ∴ Initial vapour density = (31 + 5 × 35. 5) /2 =104.25 Vapour density at equilibrium at 200°C = 70.2 ∴ Total moles at equilibrium Total moles initial = 1 + α = ( textVapour density initial/ textVapour density at equilibrium) = (104.25/70.2) = 1.485 1 + α = 1.485 α = 0.485

Q. When $PC l_{5}$ is heated it gasifies and dissociates into $PC l_{3}$ and $C l_{2}$ . The density of the gas mixture at $20 0^{\circ} C$ is $70.2$ . What is the degree of dissociation of $PC l_{5}$ at $20 0^{\circ} C$ .

$0.485$

$0.242$

$0.845$

$0.542$

Q. When PCl5​ is heated it gasifies and dissociates into PCl3​ and Cl2​ . The density of the gas mixture at 200∘C is 70.2 . What is the degree of dissociation of PCl5​ at 200∘C .

0.485

0.242

0.845

0.542

Q. When $PC l_{5}$ is heated it gasifies and dissociates into $PC l_{3}$ and $C l_{2}$ . The density of the gas mixture at $20 0^{\circ} C$ is $70.2$ . What is the degree of dissociation of $PC l_{5}$ at $20 0^{\circ} C$ .

$0.485$

$0.242$

$0.845$

$0.542$