industrial applications of equilibrium principles lesson 4
TRANSCRIPT
Industrial Applications of Equilibrium Principles
Lesson 4
The Yield of a Reaction
High yield
The yield is the amount of products.
reactants products⇌
Low yield
reactants products⇌
The Haber Process is used to make ammonia
N2(g) + 3H2(g) ⇌ 2NH3(g) + energy
4 2
To ensure a high yield- Think: what will drive the rxn to products side?
low temperature
high pressure
remove NH3
add N2 and H2
The Haber Process is used to make ammonia
N2(g) + 3H2(g) ⇌ 2NH3(g) + energy
4 2
To ensure a high rate
high temperature- 600 0C
high pressure- 20000 Kpa
add N2 and H2
add catalysts
1 2
N2O4(g) ⇋ 2NO2(g) + 59 KJ
Increasing the yield
low temperature
low pressure
add N2O4
remove NO2
1 2
N2O4(g) ⇋ 2NO2(g) + 59 KJ
Increasing the rate
high temperature
high pressure
add N2O4
add a catalyst
Yield is the amount of product relative to reactants at equilibrium.
Know the difference between Rate and Yield!
Rate is how fast you get to equilibrium.
1. What conditions will produce the greatest yield?
P2O4(g) ⇋ 2PO2(g) ∆H = -28 kJ
A. high temperature & high pressure
C. high temperature & low pressureD. low temperature & high pressure
+ 28KJ
B. low temperature & low pressure
2. What conditions will produce the greatest rate?
Zn(s) + 2HCl(aq) → H2(g) + ZnCl2(aq)
A. high Zn surface area, low [HCl], low temperatureB. low Zn surface area, high [HCl], high temperature
D. high Zn surface area, high [HCl], low temperature
C. high Zn surface area, high [HCl], high temperature
3. What increases the rate?
Zn(s) + 2HCl(aq) → H2(g) + ZnCl2(aq)
A. removing H2
B. removing ZnCl2(aq)
C. lowering pressureD. adding HCl
Graphing Equilibrium
Graphing changes imposed on the system
Graphing Equilibrium N2O4(g) ⇋ 2NO2(g) + 59 KJ
1. Adding [N2O4]
[N2O4]
[NO2] 2x
x
Graphing Equilibrium
N2O4(g) ⇋ 2NO2(g) + 59 KJ
2. Removing [NO2 ]
[N2O4]
[NO2]
2x
x
Graphing Equilibrium N2O4(g) ⇋ 2NO2(g) + 59 KJ
3. Increase Temperature
[N2O4]
[NO2] 2x
x
Graphing Equilibrium N2O4(g) ⇋ 2NO2(g) + 59 KJ
[N2O4]
[NO2]
2x
x
4. Decrease Volume- all concentrations + pressure goes up!
Page 55
Questions 27 + 28