Name _________________________________________ Date______________________

DATA SHEET....... MOLECULAR WEIGHT by the DUMAS METHOD

EXPERIMENTAL

UNKNOWN number:[____________] SS#[_________-______-__________]

Mass of VAPOR (Analytical Balance)

Trial A

Trial B

Trial C

Mass of Flask and Foil __________ __________ __________
Mass of Flask, foil and condensed vapor __________ __________ __________
Approximate minutes of heating after liquid disappeared __________ __________ __________
Temperature of boiling water bath __________ __________ __________
Mass of condensed vapor __________ __________ __________


VOLUME of FLASK (Triple Beam Bal.)
Weight of flask..................................………………...... ________________
Weight of flask filled with water........………….....….. ________________
Temperature of water...........................……………..... ________________
Atmospheric Pressure (in mm Hg or torr)................. ________________
 

CALCULATIONS

Computer Assigned TRIAL to calculate __________
Calculated weight of condensed vapor in g……... ________________
Calculated density of water filling flask.…………. ________________
Calculated Volume of flask in mL .......………….... ________________
Calculated Barometric Pressure in Atm...………... ________________
Temperature of gas calculated in K........…………. ________________

Calculated Molecular Weight..........…………..................._______________