MCAT General Chemistry Question 199: Answer and Explanation

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Question: 199

3. The summit of Mount Everest is 8.8 km above sea level. What is the approximate density of air at this point?

A. N₂
B. Br₂
C. Hg
D. Al

Correct Answer: D

Explanation:

D Enthalpy of vaporization is the heat energy required per mole to change from the liquid to gas phase. N₂ is a gas at room temperature, Br₂ and Hg are both liquids at room temperature, and Al is a solid at room temperature. Therefore, it is expected that Al will have the highest enthalpy of vaporization, making choice D correct.

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