List the substances BaCl₂, H₂, CO, HF, and Ne in order of increasing normal boiling point. Solution (a) BaCl₂-IONIC substance: strongest intermolecular force. High normal b.p. H₂ - Has ONLY LDF intermolecular forces. Its MM = 2.016 g/mol. CO - Has BOTH LDF and dipole-dipole interactions, thus dipolar forces are more predominant. HF - Has BOTH LDF and H-Bonding. Will have quite a high normal b.p. Ne - Has ONLY LDF available. Its AM = 20.180 g/mol. Thus: BaCl₂ has the highest comparative b.p. since it is ionic. When a substance has LDF only, then it is necessary to compare other factors, principally MM, AM, and/or shape. For these small molecules, mass will suffice. Lowest normal b.p. Highest normal b.p. H₂ < Ne HF < BaCl, IDF only (MM decides) < dipole-dipole < H-bond

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List the substances BaCl₂, H₂, CO, HF, and Ne in order of increasing normal boiling
point.
Solution
(a) BaCl₂-IONIC substance: strongest intermolecular force. High normal b.p.
H₂ - Has ONLY LDF intermolecular forces. Its MM = 2.016 g/mol.
CO - Has BOTH LDF and dipole-dipole interactions, thus dipolar forces
are more predominant.
HF - Has BOTH LDF and H-Bonding. Will have quite a high normal b.p.
Ne - Has ONLY LDF available. Its AM = 20.180 g/mol.
Thus: BaCl₂ has the highest comparative b.p. since it is ionic.
When a substance has LDF only, then it is necessary to compare other factors,
principally MM, AM, and/or shape. For these small molecules, mass will suffice.
Lowest normal b.p.
Highest normal b.p.
H₂ < Ne
HF < BaCl,
IDF only (MM decides) < dipole-dipole < H-bond <ionic
<CO
<
Transcribed Image Text:List the substances BaCl₂, H₂, CO, HF, and Ne in order of increasing normal boiling point. Solution (a) BaCl₂-IONIC substance: strongest intermolecular force. High normal b.p. H₂ - Has ONLY LDF intermolecular forces. Its MM = 2.016 g/mol. CO - Has BOTH LDF and dipole-dipole interactions, thus dipolar forces are more predominant. HF - Has BOTH LDF and H-Bonding. Will have quite a high normal b.p. Ne - Has ONLY LDF available. Its AM = 20.180 g/mol. Thus: BaCl₂ has the highest comparative b.p. since it is ionic. When a substance has LDF only, then it is necessary to compare other factors, principally MM, AM, and/or shape. For these small molecules, mass will suffice. Lowest normal b.p. Highest normal b.p. H₂ < Ne HF < BaCl, IDF only (MM decides) < dipole-dipole < H-bond <ionic <CO <
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