Equilibrium Question 634

Question: At a certain temp. 2HI ⇌ H2 + I2 Only 50% HI is dissociated at equilibrium. The equilibrium constant is [DCE 1999]

Options:

A) 0.25

B) 1.0

C) 3.0

D) 0.50

Show Answer

Answer:

Correct Answer: A

Solution:

$ \underset{50}{\mathop{\underset{100}{\mathop{2HI}},}}, $ ⇌ $ \underset{25}{\mathop{\underset{0}{\mathop{H_2}}}},+\underset{25}{\mathop{\underset{0}{\mathop{I_2}},}}, $

$ \frac{[H_2][I_2]}{{{[HI]}^{2}}}=\frac{25\times 25}{50\times 50}=0.25 $ .



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