Question

Which of the following gases is heavier than oxygen?

• A. Carbon dioxide
• B. Ammonia
• C. Methane
• D. Helium

Answer 1

Answer:

A. Carbon dioxide

Carbon dioxide has one carbon atom and two oxygen atoms, and a molecular weight of 44 grams per mole. The oxygen in the air is actually O2, or molecular oxygen, with a molecular weight of 32. Hence, carbon dioxide has a higher density, or is heavier than oxygen.