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Question

KP for the reaction N2+2H22NH3 is 1.6×104atm2 at 4000C. What will be KP at 5000C? The heat of reaction at this temperature is 25.14 kcal?

A
KP2=1.428×105atm2
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B
KP2=15.55×105atm2
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C
KP2=12×104atm2
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D
KP2=7.88×105atm2
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Solution

The correct option is A KP2=1.428×105atm2
Vant Hoff equation for variation of KP with temperature can be written as
2.303 logKP2KP1=H[T2T1]R×T2T1
KP1=1.6×104;T1=673K
KP2=?;T2=773K
H=25.14×103cal
R=2 cal
2.303 logKP21.6×104=25.14×1032[773673773×673]
KP2=1.428×105atm2

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