課程名稱︰物理化學一
課程性質︰必修 暑修第一類課程
課程教師︰吳嘉文 助理教授
開課學院：工學院
開課系所︰化學工程學系
考試日期（年月日）︰2009年7月6日
考試時限（分鐘）：110分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1. Suppose that a chemical reaction is caused to occur in a bulb to which is
attached to a capillary tube having a cross-sectional area of 2.5 mm^2.
The tube is open to the atmosphere, and during the course of the reaction
the rise in the capillary is 4.2 cm. Calculate the work done by the
reaction system. (10 points)
2. A sample of liquid benzene weighing 0.633g is burned in a bomb calorimeter
at 25*C, and 26.54 kJ of heat are evolved. (20 points, 10 points each)
(a) Calculate ΔU per molecule of benzene.
(b) Calculate ΔH per molecule of benzene.
[hint: C6H6(l) + 15/2 O2(g) → 6 CO2(g) + 3 H2O(l) ]
3. When 10 mol of ethylene and 20 mol of oxygen are passed through a cata-
lytic converter, after a certain time 4 mol of carbon dioxide are produced.
Calculate the amounts of ethylene and oxygen that remain unreacted. Cal-
culate also the extent of reaction on the basis of the stoichiometric
equation. (10 points, 5 points each)
(a) C2H6(g) + 7/2 O2(g) → 2 CO2(g) + 3 H2O(l)
(b) 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(l)
4. A sample of sucrose, C12H22O11 weighing 0.1328g, was burned to completion
in a bomb calorimeter at 25*C, and the heat evolved was measured to be
2186.0 J. (20 points, 10 points each)
(a) Calculate the ΔcUm and ΔcHm for the combustion of sucrose.
(b) Use data below to calculate ΔfHm for the formation of sucrose.
┌──────┬───────┐
│ Substance │ ΔfH*(kJ/mol)│
├──────┼───────┤
│ CO(g) │ -110.53 │
├──────┼───────┤
│ CO2(g) │ -393.51 │
├──────┼───────┤
│ CO2(aq) │ -413.26 │
├──────┼───────┤
│ CO3^2-(aq)│ -675.23 │
├──────┼───────┤
│ H2O(l) │ -285.83 │
├──────┼───────┤
│ H2O(g) │ -241.826 │
└──────┴───────┘
5. Two moles of oxygen gas, which can be regarded as ideal with
Cp = 29.4 J/K*mol (independent of temperature), are maintained at 273K in
a volume of 11.35 L. Suppose that the gas is heated reversibly to 373K at
constant pressure: (20 points, 4 points each)
(a) What is the final volume?
(b) How much work is done on the system?
(c) How much heat is supplied to the system?
(d) What is the increase in enthalpy?
(e) What is the increase in internal energy?
6. Suppose that 1.00 mol of an ideal monatomic gas (Cv = 1.5R) at 1 bar is
adiabatically andreversibly compressed starting at 25.0*C from 0.1000 m^3
to 0.0100 m^3. Calculate q, w ,ΔU, ΔH. (20points, 5 points each)
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