Which of the following gases has the greatest density at 35 $\circ$ C and 450 mm Hg?

Question

Quizplus · Accepted Answer

Density is directly proportional to molar mass, so we need to determine which gas has the highest molar mass. Using a periodic table, we find the molar masses of the gases as follows: 
- CH4: 16 g/mol 
- Ar: 40 g/mol 
- N2: 28 g/mol 
- Cl2: 71 g/mol 
- C2H6: 30 g/mol

Thus, Cl2 has the highest molar mass and therefore the greatest density.

Which of the Following Gases Has the Greatest Density at 35