Part C Calculate the enthalpy change, AH°, for the reverse of the formation of methane: CH(g)C(s) + 2H2(g) Express your answer to one decimal place and include the appropriate units. > View Available Hint(s) ? Value Units Kou have already submitted this answer. Enter a new answer. No credit lost. Try again.
Part C Calculate the enthalpy change, AH°, for the reverse of the formation of methane: CH(g)C(s) + 2H2(g) Express your answer to one decimal place and include the appropriate units. > View Available Hint(s) ? Value Units Kou have already submitted this answer. Enter a new answer. No credit lost. Try again.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Concept explainers
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
![On this educational web page, we are looking at a screenshot from an online homework platform, specifically from a chemistry assignment involving enthalpy calculations. The following data and problems are presented:
### Data Table
This table provides standard enthalpies of formation (ΔH_f°) for various substances:
| Substance | ΔH_f° (kJ/mol) |
|-----------|----------------|
| C(s) | 718.4 |
| CF₄(g) | –679.9 |
| CH₄(g) | –74.8 |
| H₂(g) | 217.94 |
| HF(g) | –268.61 |
**Note:** Keep in mind that the enthalpy of formation of an element in its standard state is zero.
### Part B
**Problem:** Calculate the enthalpy change, ΔH_r°, for the "expansion" of methane:
\[ \text{CH}_4(g) \rightarrow \text{C}(s) + 4\text{H}(g) \]
**Instructions:** Express your answer to one decimal place and include the appropriate units.
**Solution:**
\[ \Delta H_r° = 1665.0 \, \text{kJ} \]
The correct answer has been submitted.
### Part C
**Problem:** Calculate the enthalpy change, ΔH_r°, for the reverse of the formation of methane:
\[ \text{CH}_4(g) \rightarrow \text{C}(s) + 2\text{H}_2(g) \]
**Instructions:** Express your answer to one decimal place and include the appropriate units.
**Note:** The user has already submitted this answer. They are prompted to enter a new answer if necessary. No credit is lost; they can try again.
**Hints Available:** The platform indicates that there are hints available to assist in solving the problems.
### Additional Interface Elements
- The screenshot shows various buttons for navigating the platform, such as buttons for saving, searching, and utilizing other functions.
- User settings and areas for course tools, document sharing, and additional resources are available in the left sidebar.
- The bottom of the page notes the copyright information from Pearson Education, Inc.
This format ensures users can focus on the enthalpy calculation questions and use the provided data effectively. The platform provides supportive resources to facilitate learning and accurate problem-solving.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F24ca723d-2dd5-46d5-9d14-7e20868efa99%2Fde13b0f9-21c1-4f3f-b8ab-440a911dabfe%2F308jwcp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:On this educational web page, we are looking at a screenshot from an online homework platform, specifically from a chemistry assignment involving enthalpy calculations. The following data and problems are presented:
### Data Table
This table provides standard enthalpies of formation (ΔH_f°) for various substances:
| Substance | ΔH_f° (kJ/mol) |
|-----------|----------------|
| C(s) | 718.4 |
| CF₄(g) | –679.9 |
| CH₄(g) | –74.8 |
| H₂(g) | 217.94 |
| HF(g) | –268.61 |
**Note:** Keep in mind that the enthalpy of formation of an element in its standard state is zero.
### Part B
**Problem:** Calculate the enthalpy change, ΔH_r°, for the "expansion" of methane:
\[ \text{CH}_4(g) \rightarrow \text{C}(s) + 4\text{H}(g) \]
**Instructions:** Express your answer to one decimal place and include the appropriate units.
**Solution:**
\[ \Delta H_r° = 1665.0 \, \text{kJ} \]
The correct answer has been submitted.
### Part C
**Problem:** Calculate the enthalpy change, ΔH_r°, for the reverse of the formation of methane:
\[ \text{CH}_4(g) \rightarrow \text{C}(s) + 2\text{H}_2(g) \]
**Instructions:** Express your answer to one decimal place and include the appropriate units.
**Note:** The user has already submitted this answer. They are prompted to enter a new answer if necessary. No credit is lost; they can try again.
**Hints Available:** The platform indicates that there are hints available to assist in solving the problems.
### Additional Interface Elements
- The screenshot shows various buttons for navigating the platform, such as buttons for saving, searching, and utilizing other functions.
- User settings and areas for course tools, document sharing, and additional resources are available in the left sidebar.
- The bottom of the page notes the copyright information from Pearson Education, Inc.
This format ensures users can focus on the enthalpy calculation questions and use the provided data effectively. The platform provides supportive resources to facilitate learning and accurate problem-solving.
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