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For which of the following properties would the structural isomers C2H5OH and CH3OCH3 be expected to show identical values, assuming ideal behavior?

1. Boiling points
2. Vapour pressure at the same temperature
3. Heat of vaporization
4. Gaseous densities at the same temperature and pressure

Correct answer: Gaseous densities at the same temperature and pressure

Solution

C2H5OH and CH3OCH3 have the same molecular formula and therefore the same molar mass. At the same temperature and pressure, gaseous density = PM/RT depends only on molar mass, so their gaseous densities are identical.

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