PPT Slide

8

• The pressure exerted by the vapor in the flask at equilibrium is  called the equilibrium vapor pressure, or just the vapor pressure.

• Vapor pressure of a substance increases as temperature increases. A larger fraction of molecules move fast enough to escape the liquid.

• The vapor pressure also depends on the  intermolecular forces present.

• Molecules of substances with weaker  intermolecular attractions vaporize more  easily.

• At a given temperature, the substance  with the weakest intermolecular forces  has the highest vapor pressure.

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