4. What is the sign of the entropy change for the following reactions? Explain you a. 2Ca(s) + 02(g) →2CaO(s) b. C2H4(g) + 302(g) →2CO2(g) + 2H2O(g)
4. What is the sign of the entropy change for the following reactions? Explain you a. 2Ca(s) + 02(g) →2CaO(s) b. C2H4(g) + 302(g) →2CO2(g) + 2H2O(g)
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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Explain your answer please so I can understand why.
![**Question 4: Entropy Change in Reactions**
Determine the sign of the entropy change for the following reactions and explain your answer:
**a. Reaction:**
\[ 2\text{Ca}(s) + \text{O}_2(g) \rightarrow 2\text{CaO}(s) \]
**b. Reaction:**
\[ \text{C}_2\text{H}_4(g) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 2\text{H}_2\text{O}(g) \]
**Explanation:**
- **Entropy (S)** is a measure of the disorder or randomness of a system. In general, gases have higher entropy than liquids or solids due to the greater freedom of movement of their molecules.
- **Reaction a:** The conversion of a gas and a solid to solely solids typically results in a decrease in entropy, as the disorder decreases.
- **Reaction b:** The conversion of gases to other gases, especially with an increase in the number of gas molecules, usually results in an increase in entropy, as there is more disorder.
Consider the initial and final phases and the number of moles to determine the net change in entropy for each reaction.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe20bf933-237a-4bac-9ccb-ad53d7fa80c9%2F42e6165d-a952-4ddf-aaae-6a767f58d288%2F3p2am4b_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Question 4: Entropy Change in Reactions**
Determine the sign of the entropy change for the following reactions and explain your answer:
**a. Reaction:**
\[ 2\text{Ca}(s) + \text{O}_2(g) \rightarrow 2\text{CaO}(s) \]
**b. Reaction:**
\[ \text{C}_2\text{H}_4(g) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 2\text{H}_2\text{O}(g) \]
**Explanation:**
- **Entropy (S)** is a measure of the disorder or randomness of a system. In general, gases have higher entropy than liquids or solids due to the greater freedom of movement of their molecules.
- **Reaction a:** The conversion of a gas and a solid to solely solids typically results in a decrease in entropy, as the disorder decreases.
- **Reaction b:** The conversion of gases to other gases, especially with an increase in the number of gas molecules, usually results in an increase in entropy, as there is more disorder.
Consider the initial and final phases and the number of moles to determine the net change in entropy for each reaction.
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