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From the Periodic Table the atomic masses are:-

C = 12

H = 1

Cl = 35.5

Hence the molecular weight of CHCl3 = 12 + 1 + ( 3 x 35.5) = 119.5

Three masses of Cl = 3 x 35.5 = 106.5

Hence percentage mass of Cl in CHCl3 is

106.5 x 100 / 119.5 = 89.12%

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