Question

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​

Answer 1

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.