What is the mass of 5 moles of CL2?

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Cl2 is how Chlorine exists as a gas (diatomic) so we take the 35.45from the PTable and multiply it by 2 to get:

70.9 g/mole

5 moles (70.9g / 1 mole) = 354.5g of Cl2(g) in 5 moles of Cl2(g).