Hydrogen sulfide gas $\left(\mathrm{H}_{2} \mathrm{~S}\right)$ is responsible for the foul odor of rotten eggs. When it reacts with oxygen, sulfur dioxide gas and steam are produced.
(a) Write a balanced equation for the reaction.
(b) How many liters of $\mathrm{H}_{2} \mathrm{~S}$ would be required to react with excess oxygen to produce $12.0 \mathrm{~L}$ of $\mathrm{SO}_{2}$ ? The reaction yield is $88.5 \%$. Assume constant temperature and pressure throughout the reaction.