Midterm #2 Graded

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School

University of Washington *

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Course

152

Subject

Electrical Engineering

Date

Apr 3, 2024

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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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