Name:
Date Submitted:
Activity No. 6
HEAT OF COMBUSTION
Data and Results.
Complete the table below using the information from the Video:
Alcohols
Mass of the Alcohol Mass
and
alcohol
of
alcohol
lamp and alcohol lamp
before heating (g)
after heating (g)
Initial
Final
Temperature
Temperature
(Ti)
(Tf)
Methanol
Ethanol
Propanol
Butanol
Pentanol
Mass of
Water
______________(g)
Solve for the Enthalpy of Combustion of the different alcohols:
(Show your solutions in Photos)
ENGCHEM 101
Page 1
Name:
Date Submitted:
Questions:
1. Which of the following alcohols produced the greatest amount of energy? Which gave the
least amount of energy?
2. The heat of combustion of one gram of acetic acid in a bomb clorimeter was found to be 14.57KJ at 25°c. Calculate the enthalpy of combustion of acetic acid at 25°C.
3. The student looked in a text book and found that the actual value for the standard enthalpy change
of combustion of propan-1-ol was more exothermic than the experimental value. Suggest two reasons
for the difference between this value and the one he obtained experimentally.
a......................................................................................................................
.........................................................................................................................
b......................................................................................................................
.........................................................................................................................
4. The student repeated the experiment using the same apparatus. The water started at 60oc.
The student was surprised to find the value was less exothermic. Explain why.
ENGCHEM 101
Page 2