C19 Equilibrium Constant Kp Flashcards
Definition of total pressure
Total pressure in a reaction is the sum of all the pressures of the individual gases (partial pressure)
Definition of mole fraction
Mole fraction is the proportion of a gas in a gas mixture
What is the equation for mole fraction of gas?
Number of moles of gas/total number of moles of gas in the mixture
What is the equation for partial pressure?
Mole fraction of a gas x total pressure in the mixture
Equation for Kp
Products/Reactants
Use P to signify partial pressure
What does an increase in product mean?
A increase in Kp
What one factor affects the value of Kp
Temperature as a change in temp will change equilibrium pressures hence Kp will change
Temp change causing equilibrium to shift right means
Temperature will increase
Temp change causing equilibrium to shift left means
Temperature will decrease
Does pressure affect value of Kp?
Value of Kp is unaffected by any changes in pressure. The partial pressure ratio of reactant to products stays the same so Kp does not change.
Does catalyst affect value of Kp?
Adding a catalyst has no effect on the value of Kp speeding up the rate of forward and backward reaction speeding the rate in which equilibrium is established.
What will be the kinetic effect of increasing temperature and pressure for any reaction?
Increasing both will increase the rate of reaction.
Temp - many more particles will collide at higher speeds due to the increase in ke so more successful collisions can occur
Pressure - more particles in the same volume - more successful collisions can occur
What is partial pressure?
Each gas contribution to the total pressure
What is the Kp for this system?
aA(g) +bB(g) ⇌ cC(g)+ dD(g)
(PC)c x (PD)d / (PA)a x (PB)b
