Item #: AP8814
The Determination of Molar Mass of Gases and Volatile Liquids Classic Lab Kit for AP* Chemistry teaches students to compare the molar mass of specific gases by comparing masses of equal volumes of gases at the same temperature and pressure.
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Classic AP Requirement #3—Determination of the Molar Mass by Vapor Density
The molar masses of specific gases are found by comparing masses of equal volumes of gases at the same temperature and pressure. Oxygen gas is selected as a standard and molar masses are assigned from it. In Part 2, the molar masses of specific volatile liquids are determined in a microscale experiment and by use of the Ideal Gas Law. Students gain experience in handling gases, using the analytical balance, and in microscale chemistry procedures.
Complete for 24 students working in pairs.
Determination of the Molar Mass: Gases & Volatile Liquids Inquiry Guidance & AP* Chem Curriculum Alignment Transition Guide available! Adapt this classic AP Chemistry experiment for guided-inquiry and correlate with the AP Chemistry curriculum framework with the Flinn Scientific Inquiry Guidance and AP* Chemistry Curriculum Alignment Guide. Follow the link in Resources to find this valuable publication!
Materials Included in Kit (for 24 students working in pairs): Acetone, ethyl alcohol, isopropyl alcohol, syringes, friction caps, nails, gas delivery bag kits, Beral-type pipets.
Additional Materials Required: 0.001-g precision balances (3 to share), barometer, beakers, boiling stones, pinchcock clamps, various gas cylinders (e.g., carbon dioxide, oxygen, helium), hot plates, permanent markers, pipet tip, medicine droppers, pliers (shared), poly bags, #2 1-hole rubber stoppers, #10 1-hole rubber stoppers, scissors, support stands, test tube clamps, thermometers, latex tubing.
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