15. 2 moles of PCI, were heated in a closed vessel of 2
litre capacity. At equilibrium, 40% of PCI, dissociated
into PCl, and Cl. The value of equilibrium constant
is :
(1) 0.267
(2) 0.53
(3) 2.63
(4) 5.3
Answers
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2
Explanation:
PCl
5
PCl
3
Cl
2
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 K
c
=
[PCl
5
]
[PCl
3
][Cl
2
]
=
0.6
0.4×0.4
=0.266.
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