Chemical Equilibrium
#4

Homogeneous gaseous equilibrium

N2O4(g) 2 NO2(g)

At equilibrium, at a certain temperature, the partial pressure of N2O4(g) is 0.50 bar and the partial pressure of NO2(g) also is 0.50 bar. On increasing the total pressure to 2.00 bar at that constant temperature, calculate the partial pressures of both components.

a

Calculate Kp from the given data at equilibrium.

0.50

b

In which sense does the reaction occur owing to the increase of the total pressure?

to the left

Suppose that, in the new formed equilibrium state, PN2O4(g) = x and PNO2(g) = y.

c

Write an equation that expresses that the total pressure is equal to 2.00 bar.

x + y = 2.00

d

Write an expression for Kp.

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e

From these two equations, calculate x and y.

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Complete solution

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