Determine Kp given Reactant Partial Pressure
Let's take a look at this week's question.
We are required to determine the value of equilibrium constant, Kp, given that the equilibrium partial pressure of reactant X is 1/7 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.
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 1/7 p and Py = Pz, we can determine Py = Pz = 3/7 p
Now that we have determined all the partial pressures at equilibrium, we can write out equilibrium constant Kp and solve for it.
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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