Question

Which of the following gases has the highest density at STP?

• A. \( \text{O}_2 \)
• B. \( \text{N}_2 \)
• C. \( \text{CO}_2 \)
• D. \( \text{H}_2 \)

Hint:

Remember: At STP, the density of a gas is directly related to its molar mass. A higher molar mass leads to a higher density.