Chapter 11, Problem 48RQ

Boiling Points of Liquids

Why does ${\text{H}}_{\text{2}}\text{S}$ have a lower boiling point than ${\text{H}}_{\text{2}}\text{Se}$? Why does ${\text{H}}_{\text{2}}\text{O}$ have a much higher boiling point than ${\text{H}}_{\text{2}}\text{S}$?