Ideal Gas Law Lab

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Recommended: Chemistry chapter 14 gas laws

Vapor is the gas that forms from the vaporization of a volatile liquid. Dumas or vapor density was the method used and is done by measuring the mass of the vaporized liquid and the volume occupied by the vapor. Ideal gas law was the equation used to solve for the molecular mass of the unknown volatile sample. The purpose of this experiment is to determine the molecular mass of a substance from measurements of the density of its vapor. For the methodology, water was heated to boiling. Cap was prepared and been weighed together with the 125-mL flask. Unknown was placed in the flask and was lowered when the water reached its boiling point. It was continuously heated until the entire sample evaporated. Flask was then removed and allowed to condense. Mass …show more content…

The gas collected will be measured under the laboratory conditions of temperature and pressure. Ideal Gas Law relates the number of moles of a particular substance in a gaseous state with its volume, temperature, and pressure (Equation 1). Hence, the Ideal Gas Law can be used to determine the molar mass of a volatile liquid from the density of the vapor. Molar mass is defined in terms of the mass in grams of a substance per mole of that substance, g/mole. Equation 2, which is derived from the Ideal gas law, will be used in solving the molar mass of the unknown substance (AP Chemistry, 2010).

Equation 1: Ideal Gas Law

Equation 2: Equation derived from Ideal Gas Law

II. OBJECTIVES

The purpose of this experiment is to:
1. Determine the molecular mass of a substance from measurements of the density of its vapor.

III. MATERIALS AND METHODS

Materials to be used will be 125-mL Erlenmeyer flask, 400-mL beaker, iron stand, iron ring, clamp, crucible tongs, 100-mL graduated cylinder, thermometer, aluminum foil, heating stove and burner (if possible). Reagent needed for the experiment was the unknown liquid

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