Chapter 17, Problem 48QAP

. For the reaction
${\text{CO}}_{\text{2}}\left(g\right)+{\text{H}}_{\text{2}}\left(g\right)\rightleftharpoons \text{CO}\left(g\right)+{\text{H}}_{\text{2}}\text{O}\left(g\right)$   the equilibrium constant. K, has the value $5.21\times {10}^{-3}$at a particular temperature. If the system is analyzed at equilibrium at this temperature, it is found that $\left[\text{CO}\left(g\right)\right]=4.73\times {10}^{-3}M,\left[{\text{H}}_{\text{2}}\text{O}\left(g\right)\right]=5.21\times {10}^{-3}M$, and $\left[{\text{CO}}_{\text{2}}\left(g\right)\right]=3.99\times {10}^{-2}M$. What is the equilibrium concentration of H₂(g) in the system?