Class: BE210
Group: W2
Members: Facilitator: Janine Lupo, Time and Task Keeper: Cristian
Jurau, Scribe: John Lee, Presenter: Beney Lee
Date: May 7, 1999
Abstract:
Samples containing mixtures of sucrose with sulfur and sucrose with
L-cystine at various percent sulfur compositions were combusted in a Parr
Oxygen Bomb Calorimeter to assess the accuracy of the Parr correction factor
for sulfur. A linear dependence of the heat of formation of sulfuric
acid on the percentage of sulfur in the sample was observed for sucrose-sulfur
mixtures, though the experimental factor appeared to be 32.1 % larger than
the Parr factor. On the contrary, inconclusive results for the sucrose-cystine
samples appeared to indicate an influence of the sulfur bonding on the
overall heat of sulfuric acid formation. According to Parr Instruments
Co., the maximum percentage sulfur in the sample for which an accuracy
of 0.03% is guaranteed is 5% sulfur by mass.