Place the following substances in order of decreasing vapour pressure at a given temperature. PF₅ BrF₃ CF₄ A) BrF₃ PF₅ CF₄ B) BrF₃ CF₄ PF₅ C) PF₅ BrF₃ CF₄ D) CF₄ BrF₃ PF₅ E) CF₄ PF₅ BrF₃

Question

Place the following substances in order of decreasing vapour pressure at a given temperature. PF₅ BrF₃ CF₄ A) BrF₃ > PF₅ > CF₄ B) BrF₃ > CF₄> PF₅ C) PF₅ > BrF₃> CF₄ D) CF₄ > BrF₃ > PF₅ E) CF₄ > PF₅ > BrF₃

Quizplus · Accepted Answer

CF₄ has the weakest intermolecular forces (London dispersion forces) due to its small size and symmetrical shape, leading to the highest vapor pressure. PF₅ has moderate intermolecular forces, and BrF₃ has the strongest due to its polarity and larger size, resulting in the lowest vapor pressure.

Place the Following Substances in Order of Decreasing Vapour Pressure