Class: BE210
Group: R1
Members: FACILITATOR…………………………Nina Teng
TIME & TASK KEEPER………………Geeta Bhargave
SCRIBE……………………………….. Frank Casey
PRESENTER…………………………..Fahad Haque
COMMUNICATOR…….……………..Briseyda Morales
Date: May, 2001
Abstract:
The objective of this experiment was to determine the heat of combustion
of tryptone precisely and accurately using the Parr Bomb Calorimeter, and
to observe whether precision and accuracy vary with the mass size of the
pellet. In order to determine the energy equivalent, W, of the calorimeter,
the combustion of benzoic acid was carried out three times. The mean
W value for the three trials was found to be 2471.1 cal/°C with a 95%
confidence interval of ± 37.3 cal/°C. Twelve combustion
trials using tryptone were performed with three different mass sizes:
0.5g, 1.0g, and 1.5g. The mean heat of combustion was found to be
4894.7 cal/g with a 95% confidence interval of ± 92.1 cal/g.
Although it was determined using t-tests that the accuracy between the
three masses were not statistically different, the precision increased
with an increase in the mass of the pellet. The heat of combustion
of tryptone that was calculated using the composition was found to be 3935
cal/g with an uncertainty of ± 2.118 cal/g. The mean experimental
value differed from the calculated value by 24%.