This lecture covers the chemical equilibrium between hydrogen and carbon dioxide at room temperature, resulting in the formation of carbon monoxide and water. The instructor presents the enthalpies of the reactants and products, guides through calculating the free enthalpy of the reaction, determining the equilibrium constant, and analyzing the reaction direction at different conditions. Various calculations are performed to understand the thermodynamic aspects of the reaction, including the enthalpy and entropy changes. The lecture concludes with a practical application of calculating the amount of carbon monoxide produced at equilibrium. Students are challenged to apply thermodynamic principles to predict the feasibility and direction of the reaction.