Kp
Partial Pressure
Each individual gas in a mixture of gases exerts its own pressure – ‘partial pressure’
The total pressure of a gas mixture is the sum of all the partial pressures of the individual gases
Mole fraction of gas x total pressure of mixture
Mole Fraction
The proportion of a gas mixture that is made up of a particular gas
Sum of all mole fractions is 1
Gas Equilibrium Constant (Kp)
aA + bB ⇌ cC + dD
Partial pressures are used in kPa
Units of Kp depend on the values of a, b, c and d but are multiples of kPa
Kp is only affected by changes in the temperature – equilibrium position shifts in endothermic
direction for raising temperature and exothermic direction for lowering temperature
Partial Pressure
Each individual gas in a mixture of gases exerts its own pressure – ‘partial pressure’
The total pressure of a gas mixture is the sum of all the partial pressures of the individual gases
Mole fraction of gas x total pressure of mixture
Mole Fraction
The proportion of a gas mixture that is made up of a particular gas
Sum of all mole fractions is 1
Gas Equilibrium Constant (Kp)
aA + bB ⇌ cC + dD
Partial pressures are used in kPa
Units of Kp depend on the values of a, b, c and d but are multiples of kPa
Kp is only affected by changes in the temperature – equilibrium position shifts in endothermic
direction for raising temperature and exothermic direction for lowering temperature
