Chemistry Worksheets - Chem 340, Fall 2013 Page 13
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3.7(b) The enthalpy of vaporization of methanol is 35.27 kJ mol
at its normal boiling point of
64.1°C. Calculate (a) the entropy of vaporization of methanol at this temperature and (b) the
entropy change of the surroundings.
3.14(b) Calculate the maximum non-expansion work per mole that may be obtained from a fuel
cell in which the chemical reaction is the combustion of propane at 298 K.
(for next week!)
Problems:
−1
−1
3.3 A block of copper of mass 2.00 kg (C
= 24.44 J K
mol
) and temperature 0°C is
p,m
introduced into an insulated container in which there is 1.00 mol H
O(g) at 100°C and 1.00 atm.
2
(a) Assuming all the steam is condensed to water, what will be the final temperature of the system,
the heat transferred from water to copper, and the entropy change of the water, copper, and the
total system? (b) In fact, some water vapor is present at equilibrium. From the vapor pressure of
water at the temperature calculated in (a), and assuming that the heat capacities of both gaseous
and liquid water are constant and given by their values at that temperature, obtain an improved
value of the final temperature, the heat transferred, and the various entropies.
(Hint. You will need to make plausible approximations.)
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