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# of Moles = Mass in grams divided by Molar Mass =5o divided by (cl x 2) =50 divided by 71 =0.704 moles

use:

1 mol = Mr in grams

that is 35.5x2 g of Cl2 = 1 mol

71g of Cl2 = 1 mol

therefore 50g of Cl2 = (1/71) x 50

=0.704 mol

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