The reaction is
CH4 +2Cl2 ----------> CH2Cl2 + 2HCl
From this
1 mole ( 16g/mol) of methane produce 1 mole ( 85g/mol) of CH2Cl2
If 1.71kg = 1.71 x1000 g of methane is used , the mass of CH2Cl2 = 1.71x1000g x 85g/mol / 16g/mol
=9084.38 g
thus the theoretical yield of CH2Cl2 = 9084.38g
However the yield was only 45.6%
Thus the actual yield of CH2Cl2 = theoretical yield x % yield
= 9084.38g x 45.6/100 =4142.47 g
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