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Question

Four moles of hydrogen iodide were taken in a 10 litre flask kept at 800K. When equilibrium was attained, the mixture was found to contain 0.42 mole of iodine. Calculate the equilibrium constant for dissociation of HI.

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Solution

2HIH2+I2
Four moles of hydrogen iodide were present initially. 0.42 mole of iodine were formed from 2×0.42=0.84 moles of HI. 0.42 moles of hydrogen were also formed. 40.84=3.16 moles of HI were present at equilibrium.

The equilibrium constant Kc=[HI]2[H2][I2]
Kc=[ 3.16 mol 10 L ]2[ 0.42 mol 10 L ][0.42 mol 10 L ]
Kc=[0.316]2[0.042][0.042]
Kc=56.6

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