How many grams of CL2 are needed to produce 7.20 moles of chloroform?

3Cl2 => 2CHCl3

mols CHCl3 = 7.20
Convert to mols Cl2. 7.20 mols CHCl3 x (3 mols Cl2/2 mols CHCl3) = ?
Then ? mols Cl2 x molar mass Cl2 = grams.