x

Question 1

homogeneous equilibrium definition

Answer 1

all the species in same state or phase

Question 2

heterogeneous equilibrium definition

Answer 2

species have different state or phase

Question 3

calculate the equilibrium quantities of 2NO(g) + O₂(g) -> 2NO₂(g)
1.60mol NO(g) and 1.40mol O₂(g) are mixed together in a container with a volume 4.0dm³. At equilibrium, 1.20mol NO₂(g) has formed. Find Kc.

Answer 3

2 mol    1 mol    2 mol
1.60       1.40       0
-1.20      -0.6      +1.20
0.40      0.80     1.20
[NO(g)]= 0.4/4=0.1 moldm⁻³
[O₂(g)]=0.8/4=0.2 moldm⁻³
[NO₂(g)]= 1.2/4=0.3 moldm⁻³
Kc = (0.3)²/(0.1)²X0.2= 45dm³mol⁻¹

Question 4

write the equation for the mole fraction x(A)

Answer 4

number of moles of A/ total number of moles in gas mixture

Question 5

what is the sum of mole fractions?

Answer 5

1

Question 6

partial pressure p(A) equation

Answer 6

mol fraction of A x total pressure P

x(A) x P

Question 7

what does the sum of partial pressures equal

Answer 7

total pressure

Question 8

partial pressure for

H₂(g) + I₂(g) ⇄ 2HI(g)

Answer 8

Kp= p(HI)²/ p(H₂)/p(I₂)

Question 9

what must be ignored in a Kp expression

Answer 9

species other than gases as only gases have partial pressures