Multiple Choice
Which molecule has the highest boiling point, primarily due to hydrogen bonding between molecules?
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
Multiple Choice
Which of the following substances has the lowest boiling point at 1 atm?
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Verified step by step guidance1
Identify the substances given: NH\_3 (ammonia), CH\_4 (methane), CH\_3OH (methanol), and H\_2O (water).
Recall that boiling point depends largely on the type and strength of intermolecular forces present in the substance.
Analyze the intermolecular forces for each substance: CH\_4 has only weak London dispersion forces; NH\_3 and CH\_3OH have hydrogen bonding due to N-H and O-H bonds respectively; H\_2O has strong hydrogen bonding as well.
Since stronger intermolecular forces lead to higher boiling points, compare the strength of these forces: water has the strongest hydrogen bonding, followed by methanol and ammonia, while methane has only weak dispersion forces.
Conclude that the substance with the lowest boiling point is the one with the weakest intermolecular forces, which is methane (CH\_4).
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