Calculate the number of moles of chlorine, the volume of which, under normal conditions, takes 67.3 liters.

Given:
V (Cl2) = 67.3 l

To find:
n (Cl2) -?

Decision:
Mole is the amount of a substance in a system containing the same number of structural elements as there are atoms in carbon-12 weighing 0.012 kg.
1) Calculate the amount of substance Cl2 (under normal conditions):
n (Cl2) = V (Cl2) / Vm = 67.3 / 22.4 = 3 mol.

Answer: The amount of Cl2 substance is 3 mol.