PPT: Chemical Reaction Equilibria Mechanical Engineering Notes | EduRev

Thermodynamics

Mechanical Engineering : PPT: Chemical Reaction Equilibria Mechanical Engineering Notes | EduRev

 Page 1


Chemical Equilibrium
a b c d
1 -1
cd
1
ab
-1
cd
eq
ab
k [A] [B] k [C] [D]
k [C] [D]
k [A] [B]
[C] [D]
K 
[A] [B]
Page 2


Chemical Equilibrium
a b c d
1 -1
cd
1
ab
-1
cd
eq
ab
k [A] [B] k [C] [D]
k [C] [D]
k [A] [B]
[C] [D]
K 
[A] [B]
Chemical Equilibrium
• When equilibrium, a dynamic state, is reached 
the concentrations of A, B, C, and D are 
invariant (i.e., no longer change)
• The reaction continues in a dynamic state, but 
the concentrations remain the same.
• The rate of the forward reaction is equal to 
the rate of the reverse reaction.
Page 3


Chemical Equilibrium
a b c d
1 -1
cd
1
ab
-1
cd
eq
ab
k [A] [B] k [C] [D]
k [C] [D]
k [A] [B]
[C] [D]
K 
[A] [B]
Chemical Equilibrium
• When equilibrium, a dynamic state, is reached 
the concentrations of A, B, C, and D are 
invariant (i.e., no longer change)
• The reaction continues in a dynamic state, but 
the concentrations remain the same.
• The rate of the forward reaction is equal to 
the rate of the reverse reaction.
Chemical Equilibrium
Concentration versus time
[C] and [D]
[A] and [B]
at equilibrium
0
0.2
0.4
0.6
0.8
1
1.2
0 2 4 6 8 10 12 14 16 18 20
concentration, M
time (minutes)
Page 4


Chemical Equilibrium
a b c d
1 -1
cd
1
ab
-1
cd
eq
ab
k [A] [B] k [C] [D]
k [C] [D]
k [A] [B]
[C] [D]
K 
[A] [B]
Chemical Equilibrium
• When equilibrium, a dynamic state, is reached 
the concentrations of A, B, C, and D are 
invariant (i.e., no longer change)
• The reaction continues in a dynamic state, but 
the concentrations remain the same.
• The rate of the forward reaction is equal to 
the rate of the reverse reaction.
Chemical Equilibrium
Concentration versus time
[C] and [D]
[A] and [B]
at equilibrium
0
0.2
0.4
0.6
0.8
1
1.2
0 2 4 6 8 10 12 14 16 18 20
concentration, M
time (minutes)
Chemical Equilibrium
Rate versus time
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 2 4 6 8 10 12 14 16 18
Rate
time (minutes)
cd
-1
k [C] [D]
at equilibrium
a b c d
1 -1
k [A] [B] = k [C] [D]
ab
1
k [A] [B]
Page 5


Chemical Equilibrium
a b c d
1 -1
cd
1
ab
-1
cd
eq
ab
k [A] [B] k [C] [D]
k [C] [D]
k [A] [B]
[C] [D]
K 
[A] [B]
Chemical Equilibrium
• When equilibrium, a dynamic state, is reached 
the concentrations of A, B, C, and D are 
invariant (i.e., no longer change)
• The reaction continues in a dynamic state, but 
the concentrations remain the same.
• The rate of the forward reaction is equal to 
the rate of the reverse reaction.
Chemical Equilibrium
Concentration versus time
[C] and [D]
[A] and [B]
at equilibrium
0
0.2
0.4
0.6
0.8
1
1.2
0 2 4 6 8 10 12 14 16 18 20
concentration, M
time (minutes)
Chemical Equilibrium
Rate versus time
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 2 4 6 8 10 12 14 16 18
Rate
time (minutes)
cd
-1
k [C] [D]
at equilibrium
a b c d
1 -1
k [A] [B] = k [C] [D]
ab
1
k [A] [B]
Consider the Reaction between Hydrogen and Iodine
If the initial concentrations of hydrogen and iodine gases are 0.0175 M, 
calculate the equilibrium concentrations of the reactants and products 
if the equilibrium constant is 55.64 at 425
o
C.
2
(g)
2(g) 2(g)
HI
 = 55.64
HI
0.0175 0.0175 2
2(g) 2(g) (g)
H + I 2HI
x x x
?
2(g) 2(g) (g)
H + I 2 HI ?
Read More
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