Solution Found!
In each pair of compounds, which compound has the higher
Chapter 4, Problem 40SP(choose chapter or problem)
In each pair of compounds, which compound has the higher boiling point? Explain your reasoning.
(a) octane or 2,2,3-trimethylpentane
(b) nonane or 2-methylheptane
(c) 2,2,5-trimethylhexane or nonane
Questions & Answers
QUESTION:
In each pair of compounds, which compound has the higher boiling point? Explain your reasoning.
(a) octane or 2,2,3-trimethylpentane
(b) nonane or 2-methylheptane
(c) 2,2,5-trimethylhexane or nonane
ANSWER:
Step 1 of 4
The boiling points increase smoothly with increasing numbers of carbon atoms and increasing molecular weights. Larger molecules have larger surface areas, resulting in increased intermolecular Van der Waals attractions. These increased attractions must be overcome for vaporization and boiling to occur. Thus, a larger molecule, with greater surface area and greater Van der Waals attractions, boils at a higher temperature.