PHYSICAL CHEM - GAS EQUILIBRIA + KP
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How can the total pressure of a gas be calculated?
total pressure of a gas = the sum of all the partial pressures of the individual gases
What is the equation for mole fraction of a gas in a mixture?
mole fraction = no. of moles of gas / total no. of moles of gas in the mixture
What is the equation for partial pressure of a gas?
mole fraction of gas x total pressure of the mixture
What is the unit for partial pressure of a gas?
kPa
What is Kp?
the equilibrium constant for a reversible reaction where all the reactants and products are gases
What is the equation for Kp for this general reaction: aA (g) + bB (g) ⇋ dD (g) + eE (g)?
Kp = (PD)^d x (PE)^e / (PA)^a x (PB)^b (P = partial pressure of that gas)
Does changing temp affect Kp? Why?
• yes • changes how much product is formed at equilibrium • this changes the mole fractions of the gases present which changes their partial pressures thus affecting Kp
Does changing pressure affect Kp? Why?
• no • equilibrium shifts to oppose the change in pressure
Does addition of a catalyst affect Kp?
no