1. Convert Molecules to Moles

* Avogadro's number tells us that there are 6.022 x 10^23 molecules in one mole of any substance.

* Divide the number of molecules by Avogadro's number to find the number of moles:

(3.01 x 10^24 molecules) / (6.022 x 10^23 molecules/mol) = 5 moles of Cl₂

2. Calculate the Molar Mass of Cl₂

* The molar mass of chlorine (Cl) is 35.45 g/mol.

* Since Cl₂ has two chlorine atoms, its molar mass is:

2 * 35.45 g/mol = 70.90 g/mol

3. Calculate the Mass

* Multiply the number of moles by the molar mass:

5 moles * 70.90 g/mol = 354.5 g

Therefore, the mass of 3.01 x 10^24 molecules of Cl₂ is 354.5 grams.