Liquids have a higher vapor pressure at a higher temperature because
1. the molar enthalpy of vaporization is decreased as the temperature is raised.
2. the more rapidly moving molecules in the gas phase exert a higher pressure on the container walls.
3. a higher temperature is required to supply the heat of vaporization of the liquid.
4. more molecules in the liquid have enough kinetic energy to escape from the surface.
5. the higher temperature may exceed the critical temperature of the liquid.
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