Problem: For the reaction N2O4(g) ⇌ 2NO2(g), Kp = 0.25 at a certain temperature. If 0.040 atm of N2O4 is reacted initially, calculate the equilibrium partial pressures of NO 2(g) and N2O4(g).

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(1) Setup an ICE chart


(2) Calculating for the concentration of N2O4 and NO2

Kp = [products][reactants]Kp = [NO2]2[N2O4]0.25=(2x)20.40-x0.25=4x20.40-x(0.40-x)0.25 = 4x24x2 +0.25x -0.10 =0

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Problem Details

For the reaction N2O4(g) ⇌ 2NO2(g), Kp = 0.25 at a certain temperature. If 0.040 atm of N2O4 is reacted initially, calculate the equilibrium partial pressures of NO 2(g) and N2O4(g).

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.