Chapter 13, Problem 72APP

The numerical value of the equilibrium constant, $K_{\text{c}}$ , for the reaction of carbon and water to form carbon monoxide and hydrogen is 0.20 at ${1000}^{°}\text{C}$ . If an equilibrium mixture contains solid carbon, $0.40{\text{MH}}_2\text{O}$ , and $0.40\text{MCO}$ , what is the molar concentration of ${\text{H}}_2?(13.3,13.4)$
$\text{C}(s)+{\text{H}}_2\text{O}(g)\rightleftarrows \text{CO}(g)+{\text{H}}_2(g)$