PASCO TD-8557A Basic Calorimetry Set - Manual (Page 14)

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B a s i c C a l o r i m e t r y S e t
12
T
final
= ________________
M
final
= ________________
Calculations
According to the principle of the conservation of energy, the quantity of heat absorbed by
the ice as it melts and then heats up to the final equilibrium temperature must equal the
quantity of heat released by the warm water as it cools down to the final equilibrium tem-
perature. Mathematically:
(M
ice
)(H
f
) + (M
ice
)(1 cal/g K)(T
final
- 0° C) = (M
water
)(1 cal/g K)(T
initial
- T
final
)
M
ice
= M
final
- M
cal + water
= __________________
Use your data and the above information to determine H
f
, the latent heat of fusion per
gram of water.
H
f
= the latent heat of fusion per gram of water
Questions
1. What advantage might the commercially packaged coolant material have over ice
other than that it produces less mess? (If you didn’t perform the optional part of the
experiment, what properties would a material need in order to be a better coolant than
ice?)
2. Design an experiment to determine which of two substances (for instance, ice and
packaged coolant) will keep an insulated food cooler
a. cool for the longest time, and
b. at a lower temperature.