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Question
At a certain temperature and total pressure of 105 Pa, iodine vapour contains 40% by volume of I atoms
\[\ce{I2(g) <=> 2I(g)}\]
Calculate Kpfor the equilibrium.
Solution
Partial pressure of I atoms,
`"p"_1 = 40/100 xx "p"_"total"`
`= 40/100 xx 10^5`
Partial pressure of I2 molecules,
`"P"_("I"_2) = 60/100 xx "p"_"total"`
`= 60/100 xx 10^5`
`= 6 xx 10^4 " Pa"`
Now, for the given reaction,
`"K"_"p" = ("pI")^2/"p"_("I"_2)`
`= ((4xx10^4)^2 "Pa"^2)/((6xx10^4) "Pa")`
`= 2.67 xx 10^4` pa
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