The vapor pressure of compound A is 205 torr at 25 °C while the vapor pressure of compound B is 284 at the same temperature. Which of the following best applies to the compounds? O A) Both listed conditions are true. O B) Both listed conditions are false. C) The intermolecular forces between A molecules are less than those between B molecules. D) Compound A has a higher boiling point than compound B.
The vapor pressure of compound A is 205 torr at 25 °C while the vapor pressure of compound B is 284 at the same temperature. Which of the following best applies to the compounds? O A) Both listed conditions are true. O B) Both listed conditions are false. C) The intermolecular forces between A molecules are less than those between B molecules. D) Compound A has a higher boiling point than compound B.
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
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![**Vapor Pressure and Boiling Point Comparison of Compounds A and B**
The vapor pressure of compound A is 205 torr at 25°C while the vapor pressure of compound B is 284 torr at the same temperature. Which of the following best applies to the compounds?
- **A) Both listed conditions are true.**
- **B) Both listed conditions are false.**
- **C) The intermolecular forces between A molecules are less than those between B molecules.**
- **D) Compound A has a higher boiling point than compound B.**
**Answer:**
To solve this question, one must consider the relationship between vapor pressure, intermolecular forces, and boiling points of compounds. If a compound has lower vapor pressure at a given temperature, it generally means its molecules are held together by stronger intermolecular forces, which increases its boiling point.
**Explanation:**
- **C) The intermolecular forces between A molecules are less than those between B molecules**, is incorrect because compound A has lower vapor pressure at 25°C than compound B, indicating stronger intermolecular forces.
- **D) Compound A has a higher boiling point than compound B**, is correct because stronger intermolecular forces (indicated by lower vapor pressure) usually lead to a higher boiling point.
To conclude, vapor pressure is inversely related to the strength of intermolecular forces and directly related to the boiling point of the compound.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb21ffba4-460f-41d0-866e-5be939c02582%2Fd4610fa7-e914-4a37-b963-4a7ce140d435%2Fiuccuy9_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Vapor Pressure and Boiling Point Comparison of Compounds A and B**
The vapor pressure of compound A is 205 torr at 25°C while the vapor pressure of compound B is 284 torr at the same temperature. Which of the following best applies to the compounds?
- **A) Both listed conditions are true.**
- **B) Both listed conditions are false.**
- **C) The intermolecular forces between A molecules are less than those between B molecules.**
- **D) Compound A has a higher boiling point than compound B.**
**Answer:**
To solve this question, one must consider the relationship between vapor pressure, intermolecular forces, and boiling points of compounds. If a compound has lower vapor pressure at a given temperature, it generally means its molecules are held together by stronger intermolecular forces, which increases its boiling point.
**Explanation:**
- **C) The intermolecular forces between A molecules are less than those between B molecules**, is incorrect because compound A has lower vapor pressure at 25°C than compound B, indicating stronger intermolecular forces.
- **D) Compound A has a higher boiling point than compound B**, is correct because stronger intermolecular forces (indicated by lower vapor pressure) usually lead to a higher boiling point.
To conclude, vapor pressure is inversely related to the strength of intermolecular forces and directly related to the boiling point of the compound.
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