78. Under which conditions does nitrogen have the largest entropy per mole? N₂(s) at 50 K and 1 atm N₂0) at 70 K and 1 atm N₂(g) at 80 K and 1 atm N₂(g) at 80 K and 0.5 atm (A) (C) (B) (D)
78. Under which conditions does nitrogen have the largest entropy per mole? N₂(s) at 50 K and 1 atm N₂0) at 70 K and 1 atm N₂(g) at 80 K and 1 atm N₂(g) at 80 K and 0.5 atm (A) (C) (B) (D)
Chemistry
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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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![**Educational Transcription**
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**Question 74:**
A and B react exothermically to form a compound. A series of experiments is performed in which varying ratios of A to B are used, with a constant total number of moles, in each case. The observed temperature rise is plotted in the graph below. The simplest formula for the compound is probably:
- (A) A₃B₂
- (B) A₂B₃
- (C) AB₂
- (D) AB
**Graph Description:**
The graph plots the temperature rise (ΔT in °C) against the mole fraction of A. The temperature rise peaks at a mole fraction of A around 0.67 (approximately 0.67 on the x-axis or the ratio 2:1 of A:B). This suggests that the compound formed in this ratio exhibits the greatest exothermic reaction.
---
**Question 75:**
If a 17.0 g sample of impure nickel metal reacts under standard conditions with 25.0 L of CO to form 6.25 L of Ni(CO)₄ gas, what is the percentage of Ni in the metal sample?
**Reaction:**
\[ \text{Ni}_{(\text{s})} + 4\text{CO}_{(\text{g})} \rightarrow \text{Ni(CO)}_4{_{(\text{g})}} \]
**Molar Masses:**
- Ni: 58.7 g·mol⁻¹
- Ni(CO)₄: 171. g·mol⁻¹
- (A) 24.1%
- (B) 25.0%
- (C) 96.4%
- (D) 100%
---
**Thermochemistry Questions:**
**Question 76:**
Which molecule has the greatest bond energy?
- (A) H—Br
- (B) H—F
- (C) H—At
- (D) H—Cl
- (E) H—I
---
**Question 77:**
For which process is the entropy change per mole the largest at constant temperature?
- (A) H₂O(l) → H₂O(g)
- (B) H₂O(s) → H₂O(g)
- (C) H₂O(s) → H₂O(l)
- (D)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F148e7587-3577-41ee-af46-bb8597b6d4e9%2Fd0a6b2cc-b8b3-4650-ae3c-017621f6222d%2Fv0r41y_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Educational Transcription**
---
**Question 74:**
A and B react exothermically to form a compound. A series of experiments is performed in which varying ratios of A to B are used, with a constant total number of moles, in each case. The observed temperature rise is plotted in the graph below. The simplest formula for the compound is probably:
- (A) A₃B₂
- (B) A₂B₃
- (C) AB₂
- (D) AB
**Graph Description:**
The graph plots the temperature rise (ΔT in °C) against the mole fraction of A. The temperature rise peaks at a mole fraction of A around 0.67 (approximately 0.67 on the x-axis or the ratio 2:1 of A:B). This suggests that the compound formed in this ratio exhibits the greatest exothermic reaction.
---
**Question 75:**
If a 17.0 g sample of impure nickel metal reacts under standard conditions with 25.0 L of CO to form 6.25 L of Ni(CO)₄ gas, what is the percentage of Ni in the metal sample?
**Reaction:**
\[ \text{Ni}_{(\text{s})} + 4\text{CO}_{(\text{g})} \rightarrow \text{Ni(CO)}_4{_{(\text{g})}} \]
**Molar Masses:**
- Ni: 58.7 g·mol⁻¹
- Ni(CO)₄: 171. g·mol⁻¹
- (A) 24.1%
- (B) 25.0%
- (C) 96.4%
- (D) 100%
---
**Thermochemistry Questions:**
**Question 76:**
Which molecule has the greatest bond energy?
- (A) H—Br
- (B) H—F
- (C) H—At
- (D) H—Cl
- (E) H—I
---
**Question 77:**
For which process is the entropy change per mole the largest at constant temperature?
- (A) H₂O(l) → H₂O(g)
- (B) H₂O(s) → H₂O(g)
- (C) H₂O(s) → H₂O(l)
- (D)
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