CHM 341 Fall 2015
Homework 1
Chapter 0: Fundamentals
Problem 1: (a) 300 Torr corresponds to what pressure in kPa? (b) Convert 150 kg/m3 to grams per
dm3.
Problem 2: If a cylindrical pill with hemispherical caps, as described in
the figure at right, has di
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CHM 341 Fall 2015 - QUIZ 4
Q1 (2pts): Expansion of a gas at constant pressure produces a positive change in enthalpy. Does the
system lose or gain heat from the surroundings? Does the temperatu
CHM 341 Fall 2015
Homework 5
Chapter 3 & 4: Thermochemistry and 2nd Law
Problem 1: Classify the following as endothermic or exothermic: (a) combustion of iso-octane for which
! r H " = 5461 kJ/mol, (b) a dissolution process for which !H " =+10 kJ/mol, (c)
ﬂ Q5
0.8 Pressure ' “j
Hydrostatic pressure
In the absence cf
gravity a liquid or
gas exert the same
pressure in all
directions
The pressure in the eye cf a hurricane is T23
Terr. What is the pressure in Pa?
) Terr :. 132,2?a.
#72,; MI 1 #7537: (133.2
ﬂag 9’7
Chapter 1: Properties of gases.
Equations of State
Equation of state: provides a relation between p, V, n, T
Examples: P = EN ’7, T) Experimentally we
V = f2“), n, T) observe that
ID, V, n, T
T = fslprVr ") are not independent
etc of one another
E
gulf"
I.
Sew“ It.
Review Of important concepts. . .
Average kinetic energy of one mole of gas particles
2RT
2
pV=nRT=3nEKm
3
2
2
Average kinetic energy of a perfect gas depends only
on temperature: "“—'
EK(T1) = T1
EK (T2) T2
Average molecular speeds
CHM 341 Fall 2015
Homework 4
Chapter 2 & 3: First law and applications
Problem 1: Suppose that the expansion of a perfect gas takes place reversibly, but not
isothermally. Instead the gas cools as it expands according to T = Ti c (V-Vi) where Ti and Vi ar
Homework 6
Chapter 4: The Second Law of Thermodynamics
Problem 1: Suppose that when you exercise, you metabolize 100 g of glucose and that all the energy released as
heat remains in your body at 37 oC (body temperature). What is the entropy change of your
Homework 7
Chapter 4 & 5: Gibbs energy, material equilibrium
Problem 1: Calculate the maximum non-expansion work (per mole) that can be obtained from a fuel
cell in which the chemical reaction is the combustion of propane at 298K. To what height (in meter
Homework 8
Chapter 5 & 6: Material equilibrium & mixtures
Problem 1: Calculate the boiling point of water at the top of San Francisco Peak (elevation 3851
m), where the barometric pressure is 65 kPa [vapH = 40.7 kJ/mol at the normal boiling point].
Proble
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CHM 341 Fall 2015 - QUIZ 1
Q1 (2 points): According to the equipartition theorem what is the ratio of the average molar kinetic
energy (translational and rotational) of a gas of
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CHM 341 Fall 2015 - QUIZ 2
Q1 (2 points): The Maxwell speed distribution of gaseous He (M=4 g/mol)
at 400K is shown as the bold line in the plot. Which distribution function,
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CHM 341 Fall 2015 - QUIZ 3
Q1 (2pts): Compare the work done in the two chemical reactions shown below (assume that all
gases behave as a perfect gas). What is the ratio |wB|/|wA| of the magnitude
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CHM 341 Fall 2015 - QUIZ 5
Q1 (3pts): Classify the following processes as endothermic or exothermic: (a) freezing, (b) combustion
reaction (c) ionization of a neutral atom or molecule. You must explain
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CHM 341 Fall 2015 - QUIZ 6
Q1 (3 pts): For a certain reaction taking place at 27 oC (300 K) the enthalpy change is -90 kJ/mol
while the entropy change is -100 J K-1mol-1. (a) Calculate the change
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!
Constants:
R = 8.3144 J K-1 mol-1
1 Pa = 1 kg m-1 s-2 = N/m2
1 N = 1 kg m /s2
NA = 6.022 x 1023 mol-1
R = 1.9872 cal K-1 mol-1
1 bar = 105 Pa
1 J = 1 N m = 1 kg m2 s-2
kB = 1.3807 x 10-23 J/K
R = 0.082058 L atm K-1 mol-1
1 atm = 1.01325 bar
1 Wa
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CHM341
Midterm Exam 1 A
There are four (4) multiple-choice questions, three (3) conceptual questions, three (3)
numerical (quantitative) problems and one (1) extra credit problem based on dimensional
analysis. Constants and formulas are listed on
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CHM341
Midterm Exam 1 B
There are four (4) multiple-choice questions, three (3) conceptual questions, three (3)
numerical (quantitative) problems and one (1) extra credit problem based on dimensional
analysis. Constants and formulas are listed on
CHM 341 Fall 2015
Homework 2
Chapter 1: Properties of Perfect and Real Gases
Problem 1: Use the barometric formula (p.25 in the 6th edition textbook) to estimate the ambient
air pressure in the vicinity of an aircraft flying at an altitude of 20,000 ft if