MCAT General Chemistry Question 272: Answer and Explanation

Home > MCAT Test > MCAT general chemistry practice tests

Test Information

Use your browser's back button to return to your test results.
Do more MCAT general chemistry practice tests.

Question: 272

4. A sample of gas containing oxygen, nitrogen, argon, and carbon dioxide in equal molar proportions is in a closed container. Which of these gases would escape the fastest if a small hole were punctured in the container?

A. Nitrogen
B. Oxygen
C. Argon
D. Carbon dioxide

Correct Answer: A

Explanation:

A Since rate of effusion is inversely proportional to the square root of mass, the gas with the smallest mass will have the highest rate of effusion. Thus, N₂ (28 g/mol) will escape fastest.

Previous Next