Question

What is the equilibrium constant expression for the equation `C(s) + O_2(g) rightleftharpoons CO_2(g)`?

Answer 1

`K_(eq)` `=` `[[CO_2(g)]]/[[O_2(g)]]`

Explanation:

Carbon does not appear in the equilibrium expression, because, as a solid, it does not have a concentration. As written above, `K_(eq)` would probably be unmeasurably large.