Question

The four most common gases in the atmosphere are N₂, O₂, Ar, and CO₂. Assuming all gases are in containers of equal size, temperature, and pressure, which gas has the highest density?

a. N₂ (28.02 g/mol)
b. O₂ (32.00 g/mol)
c. Ar (39.9 g/mol)
d. CO₂ (44.00 g/mol)
e. All have the same density

Answer 1

CO₂, with a molar mass of 44.00 g/mol, has the highest density among the listed gases when temperature and pressure are held constant.

Step-by-step explanation:

The question asks which of the four most common gases in the atmosphere has the highest density, given that all gases are in containers of equal size, temperature, and pressure. Among N₂, O₂, Ar, and CO₂, we determine density based on the molecular weight when the volume, temperature, and pressure are all equal for comparison. Using the molar mass (molecular weight) of the gases, we find that CO₂, with a molar mass of 44.00 g/mol, has the highest density compared to N₂ (28.02 g/mol), O₂ (32.00 g/mol), and Ar (39.9 g/mol).