21. If an equilibrium constant is very much smaller than 1.0, what does this tell us about the standard free energy change? What does this tell us about the spontaneity of the reaction, when begun from standard conditions?

22. The decomposition of NO to oxygen and nitrogen is a highly exothermic process. Is heat absorbed, or emitted, during the decomposition? If more decomposition products are desired at equilibrium, should this reaction be carried out at high, or low, temperatures? Does the standard free energy change become more positive, or more negative, as the temperature is raised?

23. In view of your answers to Question 22, how can there be appreciable amounts of NO in a polluted atmosphere at room temperature?