Which of the following liquid substances has the highest vapor pressure at its normal boiling point? A) CH3OH (b.p. = 65 °C) B) C6H6 (b.p. = 80 °C) C) C₂H5OH (b.p. = 78 °C) D) H₂O (b.p. = 100 °C) E) All would have same vapor pressure at their normal boiling points.

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Chapter1: Chemical Foundations
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**Question:**

Which of the following liquid substances has the highest vapor pressure at its normal boiling point?

**Options:**

- **A) CH₃OH (b.p. = 65 °C)**
- B) C₆H₆ (b.p. = 80 °C)
- C) C₂H₅OH (b.p. = 78 °C)
- D) H₂O (b.p. = 100 °C)
- E) All would have the same vapor pressure at their normal boiling points.

**Explanation:**

This question is asking about vapor pressure at the normal boiling point. At its boiling point, a liquid's vapor pressure equals the external pressure. For all substances at their normal boiling points, their vapor pressure is 1 atm because that is the condition under which boiling occurs. Therefore, the correct answer is **E) All would have the same vapor pressure at their normal boiling points.**
Transcribed Image Text:**Question:** Which of the following liquid substances has the highest vapor pressure at its normal boiling point? **Options:** - **A) CH₃OH (b.p. = 65 °C)** - B) C₆H₆ (b.p. = 80 °C) - C) C₂H₅OH (b.p. = 78 °C) - D) H₂O (b.p. = 100 °C) - E) All would have the same vapor pressure at their normal boiling points. **Explanation:** This question is asking about vapor pressure at the normal boiling point. At its boiling point, a liquid's vapor pressure equals the external pressure. For all substances at their normal boiling points, their vapor pressure is 1 atm because that is the condition under which boiling occurs. Therefore, the correct answer is **E) All would have the same vapor pressure at their normal boiling points.**
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