Chapter 6, Problem 61P

Consider the following reaction.
   $\text{CO}(g){\text{ + H}}_{\text{2}}\text{O}(g)\stackrel{}{\rightleftarrows }{\text{ CO}}_2(g){\text{ + H}}_{\text{2}}(g)$
a. Write the expression for the equilibrium constant.
b. Calculate $K$ using the following concentrations of each substance at equilibrium:
   $\text{[CO] = 0}{\text{.090 M; [H}}_{\text{2}}\text{O] = 0}{\text{.12 M; [CO}}_2\text{] = 0}{\text{.15 M; [H}}_{\text{2}}\text{] = 0}\text{.30 M}\text{.}$