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  • At a certain temperature and total pressure of 10^5Pa, iodine vapour contains 40% by volume of I atoms I _2 (g) 2I (g) Calculate K_p for the equilibrium.

7.3     At a certain temperature and total pressure of 105Pa, iodine vapour contains 40% by volume of I atoms

               I_{(g)}\rightleftharpoons 2I_{(g)}

               Calculate Kp for the equilibrium.

Answers (1)

best_answer

It is given that total pressure (PT)is 10^5\ Pa and partial pressure of I atom = 40 % of PT
So, the partial pressure of I atom = \frac{40}{100}\times 10^5 = 4\times 10^4Pascal

The partial pressure of I_2 = 60% of PT

So, the partial pressure of I_2 = \frac{60}{100}\times 10^5=6\times 10^4Pascal

Now, for the reaction  I_{(g)}\rightleftharpoons 2I_{(g)}
K_p = \frac{(p_I)^2}{p_{I_2}} = \frac{(4\times 10^4)^2}{6\times 10^4}\ Pa
                           =2.67\times 10^4\ Pa

 

Posted by

manish

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