GasLaws
Name: __________________________________
Molecular Mass Determination of Butane (C4H10)
Formal Lab Report
Purpose: To determine the molar mass of butane (C4H10)
Equipment:
Piece of glass
Erlenmeyer Flask
Butane lighter
Water basin
Graduated cylinder
Procedure:
1.
2.
3.
4.
Make sure the butane lighter is dry, and find its mass.
Fill the water basin with water.
Completely fill the flask with water.
Turn the flask upside down in the water basin, making sure there are no air bubbles
are inside.
5. Bubble the gas into the flask, until only 2 or 3 cm of water remains.
6. Put the piece of glass over the top of the flask and turn it over.
7. Using the graduated cylinder, measure the amount of water needed to completely
refill the flask. This is how much gas was collected.
8. Completely dry the lighter and find its mass.
9. Clean and dry the equipment and lab station.
10. Find the room temperature and barometric pressure.
11. Write a lab report: data table, calculations (molar mass and % error), conclusion.
Use your own paper. Ignore the questions although they may help you figure out
want to do with the calculations portion of your lab report.
Questions and calculations: (In the conclusion answer these questions. Write the
question)
1. How much butane did it take to fill the flask (mass)?
2. What was the volume of the gas in mL?
3. How many liters of gas is this?
4. How many moles of gas is this?
5. What is the density of the butane in g/L
molar mass
)
22.4 L
7. The formula for butane is C4H10. What is the mass of 1.00 mole of C4H10?
6. What is the molar mass of butane? (Use this formula – Density 