Which one of the following samples of gases contains the most particles?
All gases are at 0 °C and 1 atm pressure, when 1 mole of gas has a volume of 22.4 L.
[Relative atomic mass, A_r: H = 1, He = 4, C = 12, O = 16, Cl = 35.5]
A. 33.6 L of chlorine gas
B. 66.0 g of carbon dioxide gas
C. 22.4 L of hydrogen gas
D. 10.0 g of helium gas
E. 64.0 g of oxygen gas