Question
H2O (g) -> H2(g) + 1/2 O2 (g) Express the equillibrium constant K in terms of...
H2O (g) -> H2(g) + 1/2 O2 (g)
Express the equillibrium constant K in terms of pressure P and degree of dissociation
Homework Answers
Answer #1
H2O (g) -> H2(g) + 1/2 O2 (g)
As the reactants and products both are in gaseous phase, so pressure of all the substrates would be involved in the expression for equilibrium constant
Suppose the pressure initially is P.
Let degree of dissociation be 
.
So, ICE table is:
| PH2O | PH2 | PO2 | |
| Initial | P | 0 | 0 |
| Change | -P |
+P |
+(1/2)P |
| Equilibrium | P(1-) |
P |
(1/2)P |
Equilibrium constant = K
P gets canceled in numerator and denominator.
This is the final expression for equilibrium constant.
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