Chemistry 121Nirav PatelSection 2C5 Lab Partners: Aris Karabelas and Lavon Moody Fall 2009September 9, 2009EXPERIMENT 2: MOLAR MASS OF A VOLATILE LIQUIDAbstract: The molar mass of an unknown volatile liquid is to be determined. To determine this, a small amount of an unknown volatile liquid is placed inside a flask of known mass, and then vaporized. When the volatile liquid is vaporized the gas fills up the flask, and the excess gas is pushed out of the foil through the pinhole. Theoretically the gas inside the flask will leave through the pinhole until the pressure in the flask is the same as the pressure outside of the flask (Pgas= Patm). Then the flask is cooled to room temperature and the gas condenses to a liquid. The liquid is massed and the ideal gas law is used to calculate the number of moles of the vapor. Then that number of moles of the vapor is used to calculate the molar mass of the unknown volatile liquid.
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