Chapter 2, Problem 52E

In the following equation for a chemical reaction, the notation (s), (l), or (g) indicates whether the substance is in the solid, liquid, or gaseous state: $2{\text{H}}_{\text{2}}\text{S}\left(\text{g}\right)+3{\text{O}}_2\left(\text{g}\right)\to 2{\text{H}}_{\text{2}}\text{0}\left(\text{g}\right)+2{\text{SO}}_2\left(\text{g}\right)+\text{energy}$. Identify each of the following as a product or reactant: (a) ${\text{SO}}_2\left(\text{g}\right)$; (b) ${\text{H}}_{\text{2}}\text{S}\left(\text{g}\right)$; (c) ${\text{O}}_2\left(\text{g}\right)$; (d) ${\text{H}}_{\text{2}}\text{0}\left(\text{g}\right)$. When the reaction takes place, is energy released or absorbed? Is the reaction endothermic or exothermic?