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<center>Notes on Vapor Pressure</center><br> <br> <b>Introduction</b><br> *<b>Vapor pressure</b> is the <b>pressure exerted by the vapor particles (in the gas phase) above a liquid layer</b> (the system must be closed, in other word, the container is sealed). *Vapor pressure is directly related to the intermolecular force (IMF) keeping the liquid molecules held together. Therefore, the <b>higher the IMF</b>, the <b>less amount of vapor particles are in the gas phase</b>, and therefore, the <b>lower the vapor pressure.</b> *<b>Boiling point</b> is the <b>temperature</b> where the <b>vapor pressure = atmospheric pressure.</b><br> <b>Boiling point</b> is a function of <b><nowiki>IMF</nowiki></b> and <b><nowiki>MW</nowiki></b>, molecular weight or molar mass.
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