1.10 Partial Pressures and Kp Flashcards
What is the partial pressure of a gas in a mixture?
The pressure that the gas would have if it alone occupied the volume occupied the volume occupied by the whole mixture.
if a mixture contained 3 different gases then what would the total pressure be?
P= p1 +p2 +p3
What’s the equation for partial pressure
Partial pressure = mole fraction x total pressure of gas 1
What’s the equation of mole fraction?
A mixture contains 0.2 moles N2, 0.5 moles 02, and 1.2 moles of CO2. The total pressure is 3kPa. Calculate the partial pressures of the 3 gases.
What happens if Kp is big/small?
The larger the Kp the greater the amount of products.
If Kp is small we say the equilibrium favours the reactants.
What changes Kc and Kp?
Kc and Kp only change with temperature.
They do not change if pressure or concentration are altered.
A catalyst also has no effect on KC or Kp
In an equilibrium which is exothermic in the forward reaction what will happen to Kp if temp is increased?
If temperature is increased the reaction will shift to oppose the change and move in the backward endothermic direction. The position of equilibrium shifts left. The value of Kp gets smaller as there are fewer products.
