19.2 The equilibrium constant Kp

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Why do we use Kp instead of Kc?

It is easier to measure pressure than concentration for gases.

How is Kp different to Kc?

Kp is equilibria involving gases only

What values are used to calculate Kp?

Mole fractions and partial pressure

How is the Kp equation written?

The same as Kc but use normal brackets rather than square brackets as we now work with partial pressure and not concentration.

True or false: Kc and Kp have a direct relationship

True

How do you calculate partial pressure?

partial pressure of A = mole fraction of A x total pressure


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