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Question

Choose the correct expression of Kp for reaction,
4NH3(g)+5O2(g)4NO(g)+6H2O(g)

A
Kp=[PNO]4[PH2O]6[PNH3]4[PO2]5
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B
Kp=[PNH3]4[PO2]5[PNO]4[PH2O]6
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C
Kp=[PNH3][PO2][PNO][PH2O]
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D
Kp=[PNO][PH2O][PNH3][PO2]
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Solution

The correct option is A Kp=[PNO]4[PH2O]6[PNH3]4[PO2]5
The equilibrium constant of the reaction, Kp, is the ratio of the equilibrium partial pressure of products over the equilibrium partial pressure of reactants each raised to the power of their stoichiometric coefficients.
Thus, for reaction
4NH3(g)+5O2(g)4NO(g)+6H2O(g)

Kp=[PNO]4[PH2O]6[PNH3]4[PO2]5

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