Page 1 of 7 Portage Learning CHEM 103 M3 Exam Portage Learning CHEM 103 M3 Exam .pdf
M3: Exam - Requires Respondus
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Question 1
10 /10 pts
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A reaction between HC| and NaOH is being studied in a styrofoam coffee cup
with a lid and the heat given off is measured by means of a thermometer
immersed in the reaction mixture. Enter the correct thermochemistry term
to describe the item listed.
1. The type of thermochemical process
2. The calorimeter and mixture of HCl| + NaOH
Your Answer:
1. Heat given off = Exothermic process
2. With lid = closed system
Question 2
10/ 10 pts
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, Page 2 of 7 Portage Learning CHEM 103 M3 Exam Portage Learning CHEM 103 M3 Exam .pdf
1. Show the calculation of the final temperature of the mixture when a
22.8 gram sample of water at 74.6°C is added to a 14.3 gram sample of
water at 24.3°C in a coffee cup calorimeter.
c (water) = 4.184 |/g °C
2. Show the calculation of the energy involved in freezing 54.3 grams of
water at 0°C if the Heat of Fusion for water is 0.334 kJ/g
Your Answer:
1. - (Muanrzo X Cusmrizo X Atwamnzo) = (Meooirzo X Coootvizo X Atcooitizo)
-[22.8 g x4.184 )/g °C X (Toix - 74.6°C)] =[14.3 g x 4.184 J/g °C X (T -
24.3°C)]
- [95.3952 J/C X (Tox - 74.6°C)] = [59.8312 J/°C X (Trix - 24.3°C)]
T = 55.2°C
2. Q.s =M X AHuwin = 54.3 g X 0.334 kJ/g = 18.14 k] (since heat is removed)
= -18.14 kJ
Question 3
pts
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Show the calculation of the AH of the reaction if 20.7 g of S Is reacted with
excess O, to yield 255.6 k] and sulfur trioxide by the following reaction
equation. Report your answer to 4 significant figures.
2S(s) + 30,(g0 » 2S0.(qg)
Your Answer:
This study source was downloaded by 100000869856388 from CourseHero.com on 11-10-2023 16:14:56 GMT -06:00
Portage Learning CHEM 103 M3 Exam .pdf /2026-2027 Portage Learning CHEM 103 M3 Exam .pdf 100% correct
https://www.coursehero.com/file/142186874/Portage-Chem-103-Mod-3-Examdocx/
M3: Exam - Requires Respondus
LockDown Browser + Webcam
Question 1
10 /10 pts
You may find the following resources helpful:
Scientific Calculator
Periodic Table
Equation Table Download Equation Table
A reaction between HC| and NaOH is being studied in a styrofoam coffee cup
with a lid and the heat given off is measured by means of a thermometer
immersed in the reaction mixture. Enter the correct thermochemistry term
to describe the item listed.
1. The type of thermochemical process
2. The calorimeter and mixture of HCl| + NaOH
Your Answer:
1. Heat given off = Exothermic process
2. With lid = closed system
Question 2
10/ 10 pts
You may find the following resources helpful:
Scientific Calculator
Periodic Table
Equation Table Download Equation Table
This study source was downloaded by 100000869856388 from CourseHero.com on 11-10-2023 16:14:56 GMT -06:00
Portage Learning CHEM 103 M3 Exam .pdf /2026-2027 Portage Learning CHEM 103 M3 Exam .pdf 100% correct
https://www.coursehero.com/file/142186874/Portage-Chem-103-Mod-3-Examdocx/
, Page 2 of 7 Portage Learning CHEM 103 M3 Exam Portage Learning CHEM 103 M3 Exam .pdf
1. Show the calculation of the final temperature of the mixture when a
22.8 gram sample of water at 74.6°C is added to a 14.3 gram sample of
water at 24.3°C in a coffee cup calorimeter.
c (water) = 4.184 |/g °C
2. Show the calculation of the energy involved in freezing 54.3 grams of
water at 0°C if the Heat of Fusion for water is 0.334 kJ/g
Your Answer:
1. - (Muanrzo X Cusmrizo X Atwamnzo) = (Meooirzo X Coootvizo X Atcooitizo)
-[22.8 g x4.184 )/g °C X (Toix - 74.6°C)] =[14.3 g x 4.184 J/g °C X (T -
24.3°C)]
- [95.3952 J/C X (Tox - 74.6°C)] = [59.8312 J/°C X (Trix - 24.3°C)]
T = 55.2°C
2. Q.s =M X AHuwin = 54.3 g X 0.334 kJ/g = 18.14 k] (since heat is removed)
= -18.14 kJ
Question 3
pts
You may find the following resources helpful:
Scientific Calculator
Periodic Table
Equation Table Download Equation Table
Show the calculation of the AH of the reaction if 20.7 g of S Is reacted with
excess O, to yield 255.6 k] and sulfur trioxide by the following reaction
equation. Report your answer to 4 significant figures.
2S(s) + 30,(g0 » 2S0.(qg)
Your Answer:
This study source was downloaded by 100000869856388 from CourseHero.com on 11-10-2023 16:14:56 GMT -06:00
Portage Learning CHEM 103 M3 Exam .pdf /2026-2027 Portage Learning CHEM 103 M3 Exam .pdf 100% correct
https://www.coursehero.com/file/142186874/Portage-Chem-103-Mod-3-Examdocx/
