For the reaction: h2(g) + co2(g) ⇌ h2o(g) + co(g) at 700oc, kc = 0.534, calculate the number of moles of h2 that are present at equilibrium if a mixture of 0.300 mole co and 0.300 mole h2o is heated to 700oc in a 10.0-l container.