Ammonia is made in enormous quantities by the HaberBosch process. Sulfuric acid is made in even greater quantities by the contact process. A simplified version of this process can be represented by these three reactions. \begin{array}{c} \mathrm{S}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{SO}_{2}(\mathrm{~g}) \\ 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{3}(\mathrm{~g}) \\ \mathrm{SO}_{3}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\ell) \rightleftharpoons \mathrm{H}_{2} \mathrm{SO}_{4}(\ell) \end{array} (a) Use data from Appendix J to calculate \Delta_{r} H^{\circ} for each reaction. (b) Which reactions are exothermic? Which are endothermic?(c) In which of the reactions does entropy increase? In which does it decrease? In which does it stay about the same? (d) For which reaction(s) do low temperatures favor formation of products?
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