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Principles Of Chemistry Lab Ii (Chem 1252l) The Molar Mass Of A Volatile Liquid

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University of North Carolina at Charlotte

Principles Of Chemistry Lab Ii (CHEM 1252L)

Determining the Molar Mass of a Volatile Liquid
Introduction
In the world of chemistry, it is crucial to have the ability to determine specific properties
of unknown substances in order to classify and categorize them. These properties include, but are
not limited to: the molar mass of a substance, the molar volume, density (of a gas, liquid, or
solid), partial pressure of a gas, and boiling points. In this experiment, the main focus was to
determine the molar mass of a volatile liquid after vaporization and re-condensation has been
performed. When a gas behaves ideally, it acts in a certain way that, although does not comply
with real gaseous properties, accurately gives information of the quantitative properties of the
gas. These are related through the ideal gas law:
PV = nRT
Where P is the pressure, V is the volume of the gas, n is the number of moles, R is a gas
constant, and T is the temperature of the gas converted to Kelvin.
It is a well-known fact that the density of a gas is significantly lower than that of a solid
or a liquid, simply because gaseous molecules do not stick together and completely fill the
volume of the container that they are in. Therefore, there is less mass per unit of volume of the
substance in the container. The Dumas method involves condensing a container filled with gas
into a liquid so that the mass of the liquid can be weighed and correlated with the number of
moles of gas that were produced within the flask. Since gases fill the volume of the container in
which they are placed, an effusion hole must be added to the container so that the gas may

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Principles Of Chemistry Lab Ii (Chem 1252l) The Molar Mass Of A Volatile Liquid

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