At 1000 {rm K}, the value of K_{rm c} for the reaction {rm C}left( s right) + {rm H_2O}left( g right) rightleftharpoons {rm CO}left( g right) + {rm H_2} left( g right) is 3.0 times 10^{-2}. Calculate the equilibrium concentration of {rm H_2} in a reaction mixture obtained by heating 6.75 {rm mol} of steam and an excess of solid carbon in a 7.44 {rm L} container.