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At a certain temperature , only 50% HI i...

At a certain temperature , only 50% HI is dissociated at equilibrium in the following reaction:
`2HI(g)hArrH_(2)(g)+I_(2)(g)`
the equilibrium constant for this reaction is:

A

`1.0`

B

`3.0`

C

`0.5`

D

`0.25`

Text Solution

Verified by Experts

The correct Answer is:
D
`alpha=50%=50/100=0.5`
`{:(,2HI,hArr,H_(2),+,I_(2)),("Initial",2,,0,,0),("Final",(2-2alpha),,alpha,,alpha):}`
`K=alpha^(2)/((2-2alpha)^(2))=(0.5xx0.5)/((2-2xx0.5)^(2))=0.25`
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