Valencian Community PAU Chemistry Practice Questions - Valencian Community PAU Chemistry (Química 2o Bachillerato) Exam

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Why does water (H_2O, boiling point 100 °C) have a significantly higher boiling point than hydrogen sulfide (H_2S, boiling point -60 °C)?

H_2O molecules form strong intermolecular hydrogen bonds, whereas H_2S experiences weaker dipole-dipole interactions. The H-O covalent bond inside the H_2O molecule is much stronger than the H-S bond inside H_2S. H_2O has a higher molar mass than H_2S, increasing its London dispersion forces. H_2S forms ionic lattice networks in the liquid state that decompose upon boiling.

Correct Answer:

H_2O molecules form strong intermolecular hydrogen bonds, whereas H_2S experiences weaker dipole-dipole interactions.

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