Vapour density of PCl5 is 104.16 but when heated to 230∘C its vapour density is reduced to 62.
PCl5⇔PCl3+PCl2
PCl5 ⇌ PCl3 + Cl2PCl_5\, \rightleftharpoons\, PCl_3\, +\, Cl
Initial | aaa | 0 | 0 |
Final | a−axa-axa−ax | axaxax | axaxax |
The degree of dissociation of PCl5 is 68%
Conclusion: The correct option is (D) 68%