Equilibrium constant Kp

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8 Terms

1
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Define total pressure

  • The total pressure in a reaction is the sum of all the pressures of the individual gases (partial pressure)

2
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What is a mole fraction?

  • The partial pressure of gas is calculated using mole fractions

  • A mole fraction is the proportion of a gas in a gas mixture

3
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How do you workout the mole fraction of a gas

number of moles of gas/total number of moles of gas in the mixture

4
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How do you workout partial pressure

  • Mole fraction of a gas x total pressure in mixture

5
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Kp expression

(partial pressure of products)/(partial pressure of reactants)

<p>(partial pressure of products)/(partial pressure of reactants)</p><p></p>
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Units for Kp

  • Depends

  • Write the units top and bottom and cancel. Invert the powers if there is more units under the line.

<ul><li><p>Depends </p></li><li><p>Write the units top and bottom and cancel. Invert the powers if there is more units under the line. </p></li></ul><p></p>
7
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What affects the value of Kp

  • Temperature

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How does temperature cause Kp to change

  • If temperature change causes equilibrium to shift right. Kp will increase

  • If temperature change causes equilibrium to shift left Kp will decrease