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K(c) for 3//2H(2)+1//2N(2) hArr NH(3) ar...

`K_(c)` for `3//2H_(2)+1//2N_(2) hArr NH_(3)` are `0.0266` and `0.0129 atm^(-1)`, respectively, at `350^(@)C` and `400^(@)C`. Calculate the heat of formation of `NH_(3)`.

A

12.140 k.cal

B

1.214 k.cal

C

`-12.140k.cal`

D

`-1.214K.cal`

Text Solution

Verified by Experts

The correct Answer is:
C
`2.303 log _(10) ""(K_(p_(2)))/(K_(p_(1)))=(triangleH)/(R) [(T_(2)-T_(1))/(T_(1)T_(2))]`
`2.303 log_(10)"" (0.129)/(0.266)=(triangleH)/(2) [(673-623)/(673 xx 623)]`
`triangleH=-12140 cal: =-12.140kcal`
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K_(p) for 3//2H_(2)+1//2N_(2) hArr NH_(3) are 0.0266 and 0.0129 atm^(-1) , respectively, at 350^(@)C and 400^(@)C . Calculate the heat of formation of NH_(3) .

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