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Question

A reaction mixture containing H2,N2 and NH3 has partial pressures 2 atm, 1 atm and 3 atm respectively at 725 K. If the value of Kp for the reaction, N2(g)+3H2(g)2NH3(g) is 4.28×105 atm2 at 725 K, in which direction the net reaction will go?

A
Forward
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B
Backward
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C
No net reaction
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D
Direction of reaction cannot be predicted
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Solution

The correct option is B Backward
The given reaction is, N2(g)+3H2(g)2NH3(g)
Kp=4.28×105 atm2 QP=(PNH3)2PN2×(PH2)3=(3)2(1)(2)3
Qp=98atm2=1.125 atm2.
Since value of QP is larger than KP (4.28 105atm2), it indicates net reaction will proceed in backward direction.

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