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Question

A sample of pure NO2 gas heated to 1000k decomposes : 2NO2(g)2NO(g)+)2(g). The equilibrium constant Kp is 100 atm . Analysis shows that the partial pressure of O2 is 0.25 atm at equilibrium. The partial pressure of NO2 at equilibrium is:

A
0.03
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B
0.25
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C
0.025
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D
0.04
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Solution

The correct option is C 0.025
Pressure moles
Moles of NO = 2 Moles of O2
Pressure of O2=0.25
Moles of O2 = 0.25
Pressure of NO = 2 X 0.25 = 0.5 atm
Kp=PO2×(PNO)2(PNO2)2

100=0.25×0.5×0.5(PNO2)2
PNO2=0.025
Option C is correct answer

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