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Chemistry
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Elements and Compounds

How many moles of Cl2 are in 50.0 grams of Cl2?


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2009-02-14 08:40:31
2009-02-14 08:40:31

# 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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First realize that it takes 3 CL2 to produce one mole of CHCl3. So take 1.50 moles of CHCl3 * 3 moles of Cl2 / 1 mole of CHCL3= 4.5 mole of Cl2 The the atomic weight of Cl2 is 35.5*2=71g. 4.5 mole of Cl2*71g= 319.5g. of Cl2 needed.


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