Multiple Choice
Rank the following compounds in order of decreasing vapor pressure at room temperature: CH3CH2OH, CH3OCH3, CH3CH2CH3.
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13. Liquids, Solids & Intermolecular Forces
Intermolecular Forces and Physical Properties
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Which of the following molecules has the highest boiling point at 1 atm?
A
(pentane)
B
(ethane)
C
(water)
D
(methane)
Verified step by step guidance1
Identify the types of intermolecular forces present in each molecule: pentane (C\_5H\_12), ethane (C\_2H\_6), water (H\_2O), and methane (CH\_4).
Recall that boiling point is influenced by the strength of intermolecular forces; stronger forces require more energy (higher temperature) to overcome.
Recognize that pentane, ethane, and methane are nonpolar molecules and primarily exhibit London dispersion forces, which increase with molecular size and surface area.
Understand that water is a polar molecule capable of hydrogen bonding, a much stronger intermolecular force than dispersion forces.
Conclude that because hydrogen bonding is stronger than dispersion forces, water will have the highest boiling point among the given molecules.
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