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.

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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.
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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