Vapor Pressure, Boiling Point, and Intermolecular Forces Molecules at the surfac

Question

Vapor Pressure, Boiling Point, and Intermolecular Forces Molecules at the surface of a liquid, if they possess enough kinetic energy, can escape to the gas state. As a result, a liquid will exert a vapor pressure. If the liquid is confined to a closed container, eventually the pressure reaches a constant value as a result of a dynamic equilibrium between molecules forming the gas state and those returning to the liquid state. The magnitude of the vapor pressure is determined by the strength of the intermolecular forces in the liquid and the temperature of the sample. The vapor pressure can be measured by using a manometer and is expressed using the usual units of pressure (mmHg, torr, or atm). The following liquids have about the same molar mass. The vapor pressure of each was measured in the open-ended manometer shown below. Arrange the liquids in order of decreasing height of the mercury column, designated as h in the image. Rank from largest to smallest height of the mercury column, h. To rank items as equivalent, overlap them.

Explanation / Answer

CH3CH2CH2CH2CH3 > CH3CH2CH2OCH3 > CH3CH2CHNH2(under CH)CH3 > CH3CH2CH2CH2-NH2

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