2 moles of PCl5 were heated in a closed vessel of 2 litre capacity. At equilibrium, 40% of PCl5 is dissociated into PCl3 and Cl2. The value of equilibrium constant is-
0.53
0.266
2.66
5.3
A
5.3
B
2.66
C
0.266
D
0.53
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Solution
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PCl5
PCl3
Cl2
Initial
2
0
0
Change
-0.8
0.8
0.8
Equilibrium
1.2
0.8
0.8
Molar concentration
0.6
0.4
0.4
The expression for the equilibrium constant is Kc=[PCl3][Cl2][PCl5]=0.4×0.40.6=0.266.
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