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Question

At a certain temperature and a total pressure of 105 Pa, iodine vapours contain 40 % by volume of iodine atoms
[I2(g)  2 I(g)]. Kp for the equilibrium will be
  1. 0.67
  2. 1.5
  3. 2.67 x 104
  4. 9.0 x 104


Solution

The correct option is C 2.67 x 104
Partial pressure of I atoms
(pl)=40× 105/100 Pa=0.4×105Pa

Partial pressure of l2(p2)=60× 105/100 Pa=0.6×105Pa
Kp=(p1)2/p2=(0.4× 105)2/(0.6×105)=2.67×104

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