EquilibriumConstants
H2O + CO

H2 + CO2
0.5 atm H2O + 0.5 atm CO
0.8
0.7
0.6
0.5
start
0.4
equilibrium
0.3
0.2
0.1
0
H2O
+
CO
->
H2
+
CO2
0.75 atm H2O + 0.25 atm CO
0.8
0.7
0.6
0.5
st art
0.4
equilibrium
0.3
0.2
0.1
0
H2O
+
CO
->
H2
+
CO2
0.25 atm H2O + 0.75 atm CO
0.8
0.7
0.6
0.5
st art
0.4
equilibrium
0.3
0.2
0.1
0
H2O
+
CO
->
H2
+
CO2
0.95 atm H2O + 0.05 atm CO
1
0.9
0.8
0.7
0.6
start
0.5
equilibrium
0.4
0.3
0.2
0.1
0
H2O
+
CO
->
H2
+
CO2
0.95 atm H2O + 0.05 atm CO
0.2
0.18
0.16
0.14
0.12
start
0.1
equilibrium
0.08
0.06
0.04
0.02
0
H2O
+
CO
->
H2
+
CO2
Equilibrium Pressures (atm):
H2O + CO
equal
excess H2O
excess CO
excess H2O
0.279
0.580
0.080
0.904
0.279
0.080
0.580
0.004
-> H2
0.221
0.170
0.170
0.046
+ CO2
0.221 atm
0.170
0.170
0.046
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1. Determine what is asked for
2. Identify the major chemical species
3. Determine what chemical equilibria exist
4. Write the Keq expressions
5. Organize the data and unknowns
6. Substitute and calculate
7. Check your answer - does the result make sense?