Question

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

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Solution
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Four moles of hydrogen iodide were present initially. 0.42 mole of iodine were formed from moles of HI. 0.42 moles of hydrogen were also formed. moles of HI were present at equilibrium.

The equilibrium constant
 
 
 

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