Sean drew a diagram showing four containers, each with a different gas at the same temperature, pressure, and volume. Container A contains the gas with the lowest molar mass. Which gas does container A most likely represent?

• A. CO2
• B. H2
• C. N2
• D. O2

Answer: (B)

Verified step by step guidance

1. Understand that at the same temperature, pressure, and volume, the gas with the lowest molar mass will have the lowest density and will be the lightest gas among the options.
2. Recall the molar masses of the given gases: \(\mathrm{H_2}\) (approximately 2 g/mol), \(\mathrm{N_2}\) (approximately 28 g/mol), \(\mathrm{O_2}\) (approximately 32 g/mol), and \(\mathrm{CO_2}\) (approximately 44 g/mol).
3. Compare the molar masses to identify which gas has the lowest molar mass. The gas with the lowest molar mass is the lightest and will be represented by container A.
4. Recognize that hydrogen gas (\(\mathrm{H_2}\)) has the lowest molar mass among the options, making it the most likely candidate for container A.
5. Conclude that container A most likely contains \(\mathrm{H_2}\) because it has the lowest molar mass compared to \(\mathrm{CO_2}\), \(\mathrm{N_2}\), and \(\mathrm{O_2}\).