Topic 11: Equilibria II

Question 1

What is the only factor that can effect the value of Kc?

Answer 1

Temperature

Question 2

What should we remember when writing equilibrium constants for heterogeneous reactions

Answer 2

Solids are not present in the equation as the conc of a solid at a given temp is determined by its density which has a constant value

Question 3

What does partial pressure mean ?

Answer 3

The partial pressure of a gas in a mixture of gases is the pressure that the gas would exert if it alone occupied the same volume as the mixture

Question 4

Give the equation for the Kp equilibrium constant

Answer 4

(Cp)^w (Dp)^x
Kp = ———————-
(Ap)^y (Bp)^z

Question 5

How do you calculate the partial pressure of an individual gas in a mixture of gases

Answer 5

Partial pressure = mole fraction x total pressure

Question 6

How do you calculate the mole fraction

Answer 6

number of moles of A
Mole fraction of A = —————————————-
total number of moles of gas