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Unformatted text preview: ffect of temperature on enthalpy and entropy
between standard state and 35°C is negligible.
2. Repeat the same for a temperature of 100°C, again
using similar assumptions.
3. Could you have guessed the latter without doing any
calculations? Sample Problem 6 (Tinoco ch. 3 #27):
Effect of pressure on water freezing point
The temperature of a typical laboratory freezer unit
is -20°C. If liquid water in a completely filled, closed
container is placed in the freezer, estimate the
maximum pressure developed in the container at
The enthalpy of fusion of water may be taken as
333.4 kJ/kg, independent of temperature and
pressure and the densities of ice and liquid water at
-20°C are 0.9172 and 1.00 g/cm3, respectively. . '~Q Jh 0 C~)Q-ef! ~- ~ )~d J QO r (S) Q""CH . / ( /) -Lo/e-LGJV
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