Consider the following liquids with similar molar masses. Predict which has the weakest intermolecular attractions based only on vapor pressure data.

(a) butyl alcohol (vapor pressure at 293 K = 6 torr)
(b) ethyl ether (vapor pressure at 293 K = 450 torr)
(c) pentane (vapor pressure at 293 K = 430 torr)
(d) propionic acid (vapor pressure at 293 K = 5 torr)
(e) propyl chloride (vapor pressure at 293 K = 300 torr)

Based only on vapor pressure data, ethyl ether (vapor pressure at 293 K = 450 torr) has the weakest intermolecular attractions. The correct option is B.

Explanation:

Vapour pressure can be defined as the pressure created by vapour of a substance( gas or liquid) in thermodynamic equilibrium state in a closed container at a certain temperature.

Factor which affects the vapour pressure of a substance includes:

- surface area

- intermolecular forces and

- temperature.

Strong intermolecular attractions between molecules in a medium produce a lower rate of evaporation and a lower vapour pressure. While weak intermolecular attraction between molecules in a medium produce a higher rate of evaporation and a higher vapour pressure.

From the options listed above, ethyl ether has the highest vapour pressure at the same temperature with others, therefore it will have the weakest intermolecular attractions.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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