Chapter 8, Problem 19E

Dihydrogen monosulfide reacts with sulfur dioxide according to the balanced equation:

$2{\text{H}}_2\text{S}\left(g\right)+{\text{SO}}_2\left(g\right)\to 3\text{S}\left(s\right)+2{\text{H}}_2\text{O}\left(g\right)$

If the first figure represents the amount of ${\text{SO}}_2$ available to react, which figure best represents the amount of ${\text{H}}_2\text{S}$

required to completely react with all of the ${\text{SO}}_2$

?