5.1.2 How Far?

Question 1

Mole fraction equation

Answer 1

Mole fraction of x = number of moles of x ÷ total number of moles in gas mixture

Question 2

Sum of mole fractions in gas mixture equals

Answer 2

1

Question 3

Partial pressure equation

Answer 3

Mole fraction X total pressure

Question 4

Equilibrium constant, Kp expression

Answer 4

For A2 + B2 -> 2AB
Kp = p(AB)2 ÷ p(A) X p(B)

Question 5

Kp rules

Answer 5

Only uses gases
Pascals as units

Question 6

How is Kp (and Kc) affected by temperature (exothermic forwards reaction)

Answer 6

Equilibrium constant decreases with increasing pressure
Decreases equilibrium yield of products (equilibrium shifts to left)

Question 7

How is Kp (and Kc) affected by temperature (endothermic forwards reaction)

Answer 7

Equilbrium constant increases with increasing temperature
So increase yield of products (equilibrium shifts to right)

Question 8

Effect of concentration and pressure on equilibrium constants

Answer 8

No effect

Question 9

Effect of a catalyst on equilibrium constants

Answer 9

No effect