Equilibrium Question 611
Question: 2 moles of $ PCl_5 $ were heated in a closed vessel of 2 litre capacity. At equilibrium, 40% of $ PCl_5 $ is dissociated into $ PCl_3 $ and $ Cl_2 $ . The value of equilibrium constant is [MP PMT 1989; RPMT 2000; UPSEAT 2004; Kerala CET 2005]
Options:
A) 0.266
B) 0.53
C) 2.66
D) 5.3
Show Answer
Answer:
Correct Answer: A
Solution:
$ \underset{2}{\mathop{PCl_5}}, $ ⇌ $ \underset{0}{\mathop{PCl_3}},+\underset{0}{\mathop{Cl_2}}, $
$ \frac{2\times 60}{100} $
$ \frac{2\times 40}{100} $
$ \frac{2\times 40}{100} $ Volume of container = 2 litre. $ K_{c}=\frac{\frac{2\times 40}{100\times 2}\times \frac{2\times 40}{100\times 2}}{\frac{2\times 60}{100\times 2}}=0.266 $ .
