Intermolecular Forces

AP Chemistry· difficulty 2/5

Vapor pressure (in torr) curves are shown for three liquids; horizontal dashed line is at 760 torr.

Which liquid has the lowest normal boiling point?

A
$Water$
B
$Ethanol$
C
$All three are equal$
D
$Diethyl ether$
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Explanation

The normal boiling point is where each curve crosses 760 torr. Ether crosses first (lowest T), so it has the weakest IMFs and lowest BP.

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