What phenomenon causes $ ext{Water}$ ($ ext{H}_2 ext{O}$) to boil at $100 ext{ °C}$ while the heavier $ ext{Hydrogen Sulfide}$ ($ ext{H}_2 ext{S}$) boils at $-60 ext{ °C}$?
Answer
Water forms powerful hydrogen bonds, which $ ext{H}_2 ext{S}$ lacks.
Water's capacity for strong hydrogen bonding causes a massive deviation in its boiling point trend compared to heavier molecules in the same group (like $ ext{H}_2 ext{S}$), which only rely on weaker forces.
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