MCAT General Chemistry Question 213: Answer and Explanation

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Question: 213

5. Which of the following compounds can best approximate ideal gas behavior?

A. CH₄(g)
B. NH₃(g)
C. H₂O(g)
D. HF(g)

Correct Answer: A

Explanation:

A Ideal gas behavior requires two assumptions of kinetic molecular theory. The gas is assumed to have infinitesimal molecular size and no intermolecular forces. All of the answer choices have molecules of approximately the same, small size. However, methane experiences only London dispersion forces while the other three molecules experience hydrogen bonding. This H-bonding causes the remaining answer choices to deviate significantly from ideal gas behavior.

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