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Question

3.2 moles of hydrogen iodide were heated in a sealed bulb at 4440C till the equilibrium state was reached. Its degree of dissociation at this temperature was found to be 22%. The number of moles of hydrogen iodide present at equilibrium are:

A
2.496
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B
1.87
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C
2
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D
4
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Solution

The correct option is A 2.496
Concentration of HI is 3.2
Degree of dissociation= 22%
Degree of dissociation= NumberofmolesdissociatedNumberofmolespresentinitially
22100=x3.2x=0.704
According to reaction-
2HI(g)=H2(g)+I2(g)
2M M M
2(0.352) 0.352 0.352
(10.22)×3.2
0.78×3.2=2.496

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