Determine Kp given Reactant Partial Pressure

Let's take a look at this week's question.

det Kp question

We are required to determine the value of equilibrium constant, Kp, given that the equilibrium partial pressure of reactant X is 1/p.

From the balanced equation we can see that the mole ratio for products Y and Z is 1 to 1.

This means the number of moles of Y and Z produced, and their partial pressures at equilibrium will be the same.

det Kp compare pressure for pdt Y and Z

We can add up all the partial pressures of X, Y and Z to find total pressure, which is equal to p since pressure is constant.

Since Px is 1/p and Py = Pz, we can determine Py = Pz = 3/p

det Kp det pressure at eqm

Now that we have determined all the partial pressures at equilibrium, we can write out equilibrium constant Kp and solve for it.

det Kp calculate Kp

Therefore Kp is calculated to be 9/7 p and option B is our answer.

Topic: Chemical Equilibria, Physical Chemistry, A Level Chemistry, Singapore

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