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How many grams of chlorine are contained in one mole of chlorine? How many molecules are there in 1g of chlorine Calculate the mass of one molecule of chlorine
A mole is the number of atoms in the number of grams of the relative atomic mass of an element.  Thus one mole of Chlorine-35 atoms has a mass of 35 grams, one mole of Chlorine-37 atoms has a mass of 37 grams, and one mole of Chlorine atoms selected at random has a mass of 35.453 grams. If 75% of all chlorine atoms are Cl-35 and 25% are Cl-37, then the weighted average is (0.75 × 35) + (0.25 × 37) = 35.5 
Molar mass of Cl = 35.453 g/mol


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