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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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![### Chemical Reaction Enthalpies
**Objective:**
Determine the enthalpy change (\( \Delta H \)) for the desired reaction:
\[ \text{C(s) + 2 S(s)} \rightarrow \text{CS}_2(l) \quad \Delta H = ??? \]
---
**Known Reactions:**
1. **Carbon Combustion:**
\[ \text{C(s) + O}_2(g) \rightarrow \text{CO}_2(g) \]
\[ \Delta H = -393.5 \, \text{kJ} \]
2. **Sulfur Combustion:**
\[ \text{S(s) + O}_2(g) \rightarrow \text{SO}_2(g) \]
\[ \Delta H = -296.8 \, \text{kJ} \]
3. **Carbon Disulfide Combustion:**
\[ \text{CS}_2(l) + 3 \text{O}_2(g) \rightarrow \text{CO}_2(g) + 2 \text{SO}_2(g) \]
\[ \Delta H = -1103.9 \, \text{kJ} \]
---
**Explanation:**
To find the enthalpy change for the reaction forming carbon disulfide (\( \text{CS}_2(l) \)), use Hess's Law by combining the known reactions.
- **Hess's Law** states that the total enthalpy change is the same regardless of the path taken, making it possible to use known reactions to calculate the unknown enthalpy change.
**Approach:**
- Begin with the desired reaction and rearrange the known reactions, applying the principles of thermochemistry, to solve for the unknown enthalpy change.](https://content.bartleby.com/qna-images/question/54e7981d-d827-4f19-ae94-405462a85087/5a02df29-b4ce-4f7e-b1f1-11bb47ca29c8/o2zrwqc_thumbnail.png)
Transcribed Image Text:### Chemical Reaction Enthalpies
**Objective:**
Determine the enthalpy change (\( \Delta H \)) for the desired reaction:
\[ \text{C(s) + 2 S(s)} \rightarrow \text{CS}_2(l) \quad \Delta H = ??? \]
---
**Known Reactions:**
1. **Carbon Combustion:**
\[ \text{C(s) + O}_2(g) \rightarrow \text{CO}_2(g) \]
\[ \Delta H = -393.5 \, \text{kJ} \]
2. **Sulfur Combustion:**
\[ \text{S(s) + O}_2(g) \rightarrow \text{SO}_2(g) \]
\[ \Delta H = -296.8 \, \text{kJ} \]
3. **Carbon Disulfide Combustion:**
\[ \text{CS}_2(l) + 3 \text{O}_2(g) \rightarrow \text{CO}_2(g) + 2 \text{SO}_2(g) \]
\[ \Delta H = -1103.9 \, \text{kJ} \]
---
**Explanation:**
To find the enthalpy change for the reaction forming carbon disulfide (\( \text{CS}_2(l) \)), use Hess's Law by combining the known reactions.
- **Hess's Law** states that the total enthalpy change is the same regardless of the path taken, making it possible to use known reactions to calculate the unknown enthalpy change.
**Approach:**
- Begin with the desired reaction and rearrange the known reactions, applying the principles of thermochemistry, to solve for the unknown enthalpy change.
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