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For the equilibrium N2O4 <=> 2NO2 at 40 degC, the degree of dissociation of N2O4 is 0.25 when the total pressure is 1.5 atm. Determine the degree of dissociation when the total pressure is raised to 10 atm at the same temperature.

1. 0.10
2. 0.25
3. 0.40
4. 0.50

Correct answer: 0.10

Solution

Since Kp is constant at fixed temperature, increasing the pressure shifts the equilibrium toward N2O4 (fewer moles), lowering the degree of dissociation to about 0.10.

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