Item #: AP8814
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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 and AP* Chemistry Curriculum Alignment Transition Guide available! Follow the link in Resources to find this valuable publication that lets you adapt this classic AP Chemistry experiment for guided-inquiry and correlate with the AP Chemistry curriculum framework.
Materials Included in Kit:
Acetone, 100 mL, 2
Ethyl alcohol, anhydrous, 200 mL
Isopropyl alcohol, reagent, 100 mL, 2
Clamp, pinchcock, day’s type, 2
Nail, finishing, 12
Pipet, tip only, medicine dropper, 2
Plastic tubing, ¼", 1 foot length
Poly bag, 6" x 12", 12
Rubber stopper, #10, ¾" hole, 2
Stoppers, black, rubbler, 1-hole, size #2, 2
Syringe tip closure, luer lock type, 12
Syringe, disposable, 60 mL, 12
Transfer pipet, narrow stem, 15 mL capacity bulb, 100
Tubing, latex, 4" piece, 2
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.
*Advanced Placement and AP are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, these products.
Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering Practices
Asking questions and defining problems
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking
Engaging in argument from evidence
Obtaining, evaluation, and communicating information
Disciplinary Core Ideas
HS-PS1.A: Structure and Properties of Matter
Cause and effect
Scale, proportion, and quantity
Systems and system models
Energy and matter
HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.