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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Question
![**Question 1**
How many grams of O₂ are present in a sample which occupies 750 mL at 18°C and a pressure of 735 mm Hg?
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**Question 2**
An unknown gas has a density of 1.71 g/L at 755 mm Hg, 25°C.
How many moles of unknown gas are present? [A] What is the molar mass of the unknown? [B]
---
**Question 3**
A mixture of N₂ and O₂ contains 2.7 grams of O₂ and occupies 3.1 liters at 28°C, 810 mm Hg.
How many grams of N₂ are present? [A]
What is the mole fraction of O₂? [B]
What is the mole fraction of N₂? [C]
What is the partial pressure of O₂? [D]
What is the partial pressure of N₂? [E]
---
**Question 4**
For the reaction Fe₂O₃(s) + 3 CO(g) → 2 Fe(s) + 3 CO₂(g) where 39.6 grams of Fe₂O₃ reacts at 250°C, 1.2 atm:
How many moles of CO₂(g) are produced? [A]
What volume of CO₂(g) is produced? [B]
---
**Question 5**
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Transcribed Image Text:**Question 1**
How many grams of O₂ are present in a sample which occupies 750 mL at 18°C and a pressure of 735 mm Hg?
---
**Question 2**
An unknown gas has a density of 1.71 g/L at 755 mm Hg, 25°C.
How many moles of unknown gas are present? [A] What is the molar mass of the unknown? [B]
---
**Question 3**
A mixture of N₂ and O₂ contains 2.7 grams of O₂ and occupies 3.1 liters at 28°C, 810 mm Hg.
How many grams of N₂ are present? [A]
What is the mole fraction of O₂? [B]
What is the mole fraction of N₂? [C]
What is the partial pressure of O₂? [D]
What is the partial pressure of N₂? [E]
---
**Question 4**
For the reaction Fe₂O₃(s) + 3 CO(g) → 2 Fe(s) + 3 CO₂(g) where 39.6 grams of Fe₂O₃ reacts at 250°C, 1.2 atm:
How many moles of CO₂(g) are produced? [A]
What volume of CO₂(g) is produced? [B]
---
**Question 5**
[Content not visible in the image]
![Certainly! Below is the transcription of the text from the image for educational purposes:
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**Question 4**
For the reaction \( \text{Fe}_2\text{O}_3(s) + 3 \text{CO}(g) \rightarrow 2 \text{Fe}(s) + 3 \text{CO}_2(g) \) where 39.6 grams of \( \text{Fe}_2\text{O}_3(s) \) reacts at 250°C, 1.2 atm:
- How many moles of \( \text{CO}_2(g) \) are produced? [A]
- What volume of \( \text{CO}_2(g) \) is produced? [B]
**Question 5**
Argon takes 45 seconds to effuse through a pinhole. How long would it take for \( \text{CH}_4 \) to effuse through the same hole? [A]
**Question 6**
What is the final temperature of a 5 gram sample of gold (c = 0.129 J/g°C), initially at 220°C, which absorbs 7.33 J of heat?
**Question 7**
A sample of NaCl weighing 2.3 grams is dissolved in 50 grams of water (c = 4.18 J/g°C). The temperature of the water fell from 25°C to a final temperature of 22.3°C:
- What is \( q \) for the given reaction? [A]
- What is \( \Delta H \) for dissolving 1 mole of NaCl? [B]
**Question 8**
How much heat is generated in the production of 31.6 grams of \( \text{Al}_2\text{O}_3? \)
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No graphs or diagrams are included in the image.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd030d919-6a7f-4fa6-aa03-a2d1c75d7f00%2Fece09d1f-833d-4381-91a9-55da1106f2e0%2Fdg49jsf.jpeg&w=3840&q=75)
Transcribed Image Text:Certainly! Below is the transcription of the text from the image for educational purposes:
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**Question 4**
For the reaction \( \text{Fe}_2\text{O}_3(s) + 3 \text{CO}(g) \rightarrow 2 \text{Fe}(s) + 3 \text{CO}_2(g) \) where 39.6 grams of \( \text{Fe}_2\text{O}_3(s) \) reacts at 250°C, 1.2 atm:
- How many moles of \( \text{CO}_2(g) \) are produced? [A]
- What volume of \( \text{CO}_2(g) \) is produced? [B]
**Question 5**
Argon takes 45 seconds to effuse through a pinhole. How long would it take for \( \text{CH}_4 \) to effuse through the same hole? [A]
**Question 6**
What is the final temperature of a 5 gram sample of gold (c = 0.129 J/g°C), initially at 220°C, which absorbs 7.33 J of heat?
**Question 7**
A sample of NaCl weighing 2.3 grams is dissolved in 50 grams of water (c = 4.18 J/g°C). The temperature of the water fell from 25°C to a final temperature of 22.3°C:
- What is \( q \) for the given reaction? [A]
- What is \( \Delta H \) for dissolving 1 mole of NaCl? [B]
**Question 8**
How much heat is generated in the production of 31.6 grams of \( \text{Al}_2\text{O}_3? \)
---
No graphs or diagrams are included in the image.
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