At a certain temperature and a total pressure of 105 Pa, iodine vapour

Question

At a certain temperature and a total pressure of

10_{5}

Pa, iodine vapours contain

40 %

by volume of iodine atoms

[I_{2} (g) ⇋ 2 I (g)] . K_{p}

for the equilibrium will be

Options:

A . 0.67

B . 1.5

C . 2.67 × 104

D . 9.0 × 104

Answer: Option C
:
C
Partial pressure of I atoms

(p_{l}) = 40 \times 10^{5} / 100 P a = 0.4 \times 10^{5} P a

Partial pressure of

l_{2} (p_{2}) = 60 \times 10^{5} / 100 P a = 0.6 \times 10^{5} P a

K_{p} = (p_{1})^{2} / p_{2} = (0.4 \times 10^{5})^{2} / (0.6 \times 10^{5}) = 2.67 \times 10^{4}

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