Midterm #2 Graded
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School
University of Washington *
*We aren’t endorsed by this school
Course
152
Subject
Electrical Engineering
Date
Apr 3, 2024
Type
Pages
10
Uploaded by DeaconEnergyJackal34
Graded
152A Wi24 Exam 2
Student
Emma Bols
Total Points
44 / 100 pts
Question 1
Q1
13
/ 16 pts
+ 5 pts
Correct use of Hess's Law
+ 8 pts
Correct calculation of component ΔHs
− 2 pts
Minor errors in calculation of component ΔHs
− 5 pts
Major errors in calculation of component ΔHs
+ 3 pts
Correct final answer (1 mol product formed)
− 1 pt
Incorrect units on final answer
+ 0 pts
Nothing correct
Question 2
Q2
7
/ 17 pts
+ 17 pts
Totally Correct
+ 4 pts
Correct q setup
+ 3 pts
Correct q
+ 3 pts
Correct # moles + 3 pts
ΔH/mol calculation correct
+ 4 pts
Correct overall answer
+ 0 pts
Nothing correct
− 1 pt
Incorrect units on final answer
Question 3
Q3
12
/ 16 pts
Method 1
+ 8 pts
Method 1 - correct ΔG°rxn @ 498K
− 4 pts
Method 1 - used 298K
+ 8 pts
Method 1 - correct K from ΔG°rxn vs. lnK equation
− 2 pts
Method 1 - used incorrect ΔG°rxn to get K
Method 2
+ 5 pts
Method 2 - correct van't Hoff setup
+ 5 pts
Method 2 - correct ln(K)
+ 6 pts
Method 2 - correct K
− 4 pts
Incorrect unit conversions
− 4 pts
Calculation error
+ 0 pts
Nothing correct
Question 4
Q4
0
/ 17 pts
+ 17 pts
Completely correct
+ 3 pts
Isothermal expansion step - setup
+ 3 pts
Isothermal expansion step - Answer
+ 3 pts
Isochoric cooling step - setup
+ 3 pts
Isochoric cooling step - Answer
+ 5 pts
Correct final answer
− 1 pt
Incorrect units on final answer
+ 0 pts
Nothing correct
see key
Question 5
Q5
0
/ 17 pts
+ 17 pts
Totally correct
+ 6 pts
Recognize ΔS recompression = - ΔS expansion
+ 6 pts
ΔS = -q/T used
+ 3 pts
Answer is 2 J/k
+ 5 pts
Correct final answer
+ 0 pts
Nothing correct or No response
− 1 pt
Incorrect units on final answer
Question 6
Q6
12
/ 17 pts
+ 6 pts
Calculate ΔGrxn
+ 6 pts
Use Hess's law
+ 5 pts
Correct final answer
− 1 pt
Incorrect units on final answer
+ 0 pts
Nothing correct
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