Homework #1 (Due 1/19/2016)
1. Please give a one-sentence description of thermodynamics.
2. Describe the analogy between energy and money, heat and dollar? Why as an
engineer, you must understand how the energy/heat flow?
3. Describe the contribution of S

Problem 3.13
The mixing tank shown here initially contains 50kg of water at 25oC. Suddenly the
two inlet valves and the single outlet valve are opened, so that two water streams,
each with a flow rate of 5kg/min, flow into the tank, and a single exit stre

CBEMS 45B Homework 7
Due Thursday 3/15/2012 9:30 am
1. Problem 4.31 part b.
System: open, steady state.
dM
= 0 = M 1+ M 2
Mass balance:
M1 = M 2 = M
dt
dU
= 0 = M 1 H 1 + M 2 H 2 + Q+ W s
Energy balance:
dt
dS
Q
Entropy balance:
= 0 = M 1 S 1 + M 2 S 2 +

1
University of California, Irvine
Chemical Engineering and Materials Science
Mechanical and Aerospace Engineering
CBEMS155/MAE156
Winter 2012
FAM
Saturday, January 27th
Informal Discussion: Examples 1
1. CsCl is an ionic structure that has 8 ions of Cs +

CBEMS 45B Exam #1 Solution
1. What is the respective contribution by J.R. Mayer, L.F. von Helmholtz, J.P. Joule
to the development of the first law in thermodynamics? List one of the
contributions by William Thompson and Rudolf Clausius to thermodynamics.

University of California, Irvine
Chemical Engineering and Materials Science
Mechanical and Aerospace Engineering
CBEMS155/MAE156
Winter 2012
FAM
Due: Monday, Feb.6th
(By 3:00 p.m.)
Take Home Quiz #2 (Outcome # 1)
A cylindrical block of brass, 160 mm high

Exam #1 solution
1. (10) What is the first law of thermodynamics? Write down the energy balance equation for: (a)
general processes; (b) closed systems; (c) adiabatic processes; (d) simple open systems.
Answer: First law: energy conservation. Energy can b

1
University of California, Irvine
Chemical Engineering and Materials Science
Mechanical and Aerospace Engineering
CBEMS155/MAE156
Winter 2012
FAM
Due: Friday, January 20th
Problem Set 1
1. Problem 1.1 in the text. (0.367 GPa)
2. Problem 1.7 in the text (

HW 2 solutions
1. At high temperatures phosphine (PH3) dissociates into phosphorus and hydrogen by
the following reaction:
4 PH 3 P4 + 6 H 2
At 800 the rate at which phosphine dissociates is
dCPH 3
= 3.715 10 6 CPH 3
dt
for t in seconds. The reaction occu

HW 4 solutions
1. Steam at 500 bar and 600 is to undergo a Joule-Thomson expansion to
atmospheric pressure. What will be the temperature of the steam after the
expansion? What would be the downstream temperature if the steam were
replaced by an ideal gas?

Homework #1 (Due 1/20/2015)
1. Please give a one-sentence description of thermodynamics.
2. Describe the analogy between energy and money, heat and dollar? Why as an
engineer, you must understand how the energy/heat flow?
3. Describe the contribution of S

45B Homework #3 (Due 2/5/2015)
1. (a) Derive the general expression of Cp and Cv
(b) What do CP*, CV*, U* and H* mean?
(c) What is the definition between CP* and CV*?
(d) Write down the expression for CP*(T).
2. What are the four assumptions for idea gas?

CBEMS 45B Homework 6 ( Due 3/5/2015)
1. Write down the thermodynamic functions for natural variables: U, H, A, G, S.
2. What are the equilibrium conditions for the following cases:
a. Constant U,V,N
b. constant S, P,N
c. constant T,V,N
d. Constant T,P,N
3

Exam #1 solution
1. (10) What is the first law of thermodynamics? Write down the energy balance equation for: (a)
general processes; (b) closed systems; (c) adiabatic processes; (d) simple open systems.
Answer: First law: energy conservation. Energy can b

HW #2 Solution
1-11. Please find answers from your lecture notes.
12-13. Examples shown in the lecture.
14. Since for the ideal gas, enthalpy is a function of temperature only,
thus, H1(P1,T1) = H2(P2,T2) becomes H1(T1) = H2(T2),
which implies that T2=400

Homework #5 (Due 2/24/2015)
1. Using an isolated system consisting of two open subsystems as an example to
demonstrate that the internal generation rate of entropy is always positive so long
there is a temperature gradient in the system. When does the iso

45B Homework #5 Solution
For problem 1-8, please find answers in your notes.
Problem 9.
G(T,P,N), we have + +
+ 0
(1)
Because + = ( )
Then expression (1) becomes
( ) + + + 0
According to the definition of , =
So that ( ) = 0 and + + 0
(2)
At equilibriu

Homework #2 (Due 1/29/2015)
1. Please describe Gibbss contributions.
2. Write down the expression for work of a flowing fluid against pressure
3. Write down the work due to deformation of system boundary
4. What is relationship between enthalpy and intern

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verb 5 haw-RU U Wm (10 .
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mum? #_ w

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mm Mime Er;- mu
-. sun.- _1_:_._._' -_. .
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1. What is she entropy? (15%)
Answer: The part of internal or total energy nol avatiable for useful work; or the inlet-us
energy wasted or lost

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7115 = (w _ aw + Trngen Z cfw_1th
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4. Derive the cxprcsainn for cniculnl

CBEMS 45B Process Engineering Fundamentals: General Thermodynamics and Energy Balances
Catalog Data:
Prerequisites:
Textbook:
Reference:
CBEMS 45B Process Engineering Fundamentals: General
Thermodynamics and Energy Balances (Credit Units: 3)
Overview of g