B. Molar Mass of a Vapor
1. Unknown liquid number
2. Mass of flask + cap + rubber band
3. Temperature of boiling water
Correction
Corrected temperature °C
4. Barometric pressure ____ mm Hg
5. Mass of flask + rubber band + cap + condensed vapor
6. Mass of condensed liquid
7. Volume of flask _____ mL
8. Molar mass of vapor _____
(show calculations)
QUESTIONS
1. If an insufficient amount of liquid unknown had been used, how would this have affected the value of the experimental molar mass?
2. What are the major sources of error in your determination of the molar mass?
3. If the flask was not thoroughly wiped dry, how would this attect the molat mass
4. Isobutyl alcohol has a boiling point of 108°C. How would you modify the procedure used in this experi- ment to determine its molar mass?
