21.5 equilibria (Kp)

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9 Terms

1
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general Kp expression

Kp= p (partial pressure of products) / p (partial pressure of reactants)

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Kp expression for H2(g) + I2(g) ⇌ 2HI(g)

Kp= p(HI)2 / p(H2) x p(I2)

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what is excluded from a Kp expression?

Pure solids and pure liquids. only gases included

4
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how to calculate mole fractions?

moles of gas / total moles of all gases

5
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how do you calculate partial pressure?

mole fraction x total pressure

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what units does Kp have?

depends on the overall change in gaseous moles in the equation (but mol dm-3)


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when is Kp unitless?

when total gaseous moles of products = reactants

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what changes the Kp value?

only temperature.

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when does not change the value of Kp?

changing concentration or pressure, or adding a catalyst does not change Kp