Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 103SCQ: You want to determine the value for the enthalpy of formation of CaSO4(s), but the reaction cannot...
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Question
I just want to make sure if my work is correct. I also need help answering questions 5 and 6 on the last page. Please and thank you.
![Gerardo Benitez
Chemistry 1A
Name
Lab Partner Hector
Part 2C: Heat of Formation of Metal oxide (Enthalpy of formation of metal oxide)
1) Write the balanced equation for the heat of formation of magnesium oxide and zine oxide.
Ma (s)+ Ź O2 (9) Mg O (s)
2) Using Hess's Law, determine the enthalpy of formation of both the metal oxides, MgO and ZnO.
To do this, you will need the balanced thermochemical equations for the two reactions studicd in
this lab, plus the balanced thermochemical equation for the formation of water from its clements.
Clearly show below how these three equations (and their reaction enthalpies) must be combined to
give the target reaction for enthalpy of formation of both the metal oxides. (For the metal/ metal
oxide that was not assigned to you, take the data for AHn from students on your bench)
Enthalpy of formation of MgO: (Show equations and calculations below)
Mg(3)サ 2HC1(ag)→
(aq) + H2 9)
(a2) t
My Orso
AH3=-285,9 ks/mc
Mg (s)+ b Oz(9) + Mg Ors)
Enthalpy of formation of ZnO: (Show equations and calculations below)
Experiment 3-Thermochemistry-Calorimetry and Hess's Law
Page 8 of 12](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8269917f-e65a-4c61-8f6b-ddb45740edf7%2F9ae44b72-5d72-4fe7-afc0-5f85c812feca%2F4dkxe8m_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Gerardo Benitez
Chemistry 1A
Name
Lab Partner Hector
Part 2C: Heat of Formation of Metal oxide (Enthalpy of formation of metal oxide)
1) Write the balanced equation for the heat of formation of magnesium oxide and zine oxide.
Ma (s)+ Ź O2 (9) Mg O (s)
2) Using Hess's Law, determine the enthalpy of formation of both the metal oxides, MgO and ZnO.
To do this, you will need the balanced thermochemical equations for the two reactions studicd in
this lab, plus the balanced thermochemical equation for the formation of water from its clements.
Clearly show below how these three equations (and their reaction enthalpies) must be combined to
give the target reaction for enthalpy of formation of both the metal oxides. (For the metal/ metal
oxide that was not assigned to you, take the data for AHn from students on your bench)
Enthalpy of formation of MgO: (Show equations and calculations below)
Mg(3)サ 2HC1(ag)→
(aq) + H2 9)
(a2) t
My Orso
AH3=-285,9 ks/mc
Mg (s)+ b Oz(9) + Mg Ors)
Enthalpy of formation of ZnO: (Show equations and calculations below)
Experiment 3-Thermochemistry-Calorimetry and Hess's Law
Page 8 of 12
![Name_Gerade Benidez
Chemistry 1A
Lab PartnerHector
3) Write the AH value for the metal oxides from the table in the textbook.
-C01.8 Ko/mol
MgO:
4) Determine the percent error in the experimentally determined value for the enthalpy of formation
of both metal oxides.
Theor Exp.!
f erfor-
x100=
Theo
Xl00
= -23. 56 %
-601.8
-2 36%
5) Discuss the sources of error in your experiment.
6) List three practical applications of MgO and Z0.
Experiment 3-Thermochemistry-Calorimetry and Hess's Law
Page 9 of 12](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8269917f-e65a-4c61-8f6b-ddb45740edf7%2F9ae44b72-5d72-4fe7-afc0-5f85c812feca%2Ftp1auw9_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Name_Gerade Benidez
Chemistry 1A
Lab PartnerHector
3) Write the AH value for the metal oxides from the table in the textbook.
-C01.8 Ko/mol
MgO:
4) Determine the percent error in the experimentally determined value for the enthalpy of formation
of both metal oxides.
Theor Exp.!
f erfor-
x100=
Theo
Xl00
= -23. 56 %
-601.8
-2 36%
5) Discuss the sources of error in your experiment.
6) List three practical applications of MgO and Z0.
Experiment 3-Thermochemistry-Calorimetry and Hess's Law
Page 9 of 12
Expert Solution
![](/static/compass_v2/shared-icons/check-mark.png)
Step 1
1,2,3 and 4 is correct.
5. Sources of error
a. At the time of measuring weight , fault in digital device.
b. Spilling of salt and liquid.
c. Leak in CALORIMETER.
d. Not stirring solution too well.
e. Incorrect reading of thermometer.
Step by step
Solved in 2 steps
![Blurred answer](/static/compass_v2/solution-images/blurred-answer.jpg)
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