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CHM201 General Chemistry and Laboratory I

Laboratory 6 – Ideal Gas Experiments

November 3, 2021

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PLEASE ENABLE EDITING BEFORE FILLING OUT THIS REPORT!

Report Due by November 28, 2021.

No report will be accepted for credit after December 5, 2021

Grade:

Lab average to date:

Overall average to date:

1. Determination of the Ideal Gas Constant "R" using Carbon Dioxide. (Report 3 digits for this exercise. No points will be deducted for significant digit errors.) (20 points)

Mass of beaker (optional)
Mass of plastic bag (optional)
Temperature (in the bag)
Volume of plastic bag
Barometric pressure

Trial	1	2	3	4 (wet)	5 (wet)
Mf
Mi
R
Rave
% Error

2. Determining the Molecular Weight of a Gas. (SIGNIFICANT FIGURES MATTER HERE!) (30 pts)

Room temperature – TR
Water temperature - Tw
Barometric Pressure – Patm
Vapor Pressure of Water – Pwater
Pressure of Butane – Pbutane (Patm- Pwater)

Trial	1	2	3	Total
Mf
MI
Mbutane
Vbutane
			Molar Mass

3. Pressure/Volume Measurements. (Report 3 digits for this exercise. No points will be deducted for significant figure errors.) (20 points)

V	20 cm3	16 cm3	9 cm3	6 cm3	4 cm3
P
PV

V	5 cm3	10 cm3	20 cm3
P
PV

V	20 cm3	10 cm3	5 cm3
P
PV

Questions (30 points)

1. How do you explain the large percent error in the gas constant determination? There are both experimental and scientific factors involved. Include both.

2. If some water remained on the lighter at the time of the second weighing (after collecting the gas), how would this affect your determination of molecular weight? Be specific. Show a sample calculation to clarify your answer.

3. Which of the individual gas laws is confirmed by the results of part 3?