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Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in 35 g of chloroform. Molecular mass of anthracene is (Kb for CHCl3=3.9 K. kg mol−1)

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a

79.42 g/mol

b

132.32 g/mol

c

177.42 g/mol

d

242.32 g/mol

answer is C.

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Detailed Solution

Here : ΔTb=0.323 Kw=0.5143 g weight of anthracene. W = 35 g weight of chloroform Kb=Molal elevation constant (3.9 K. kg/mol) m=Kb×w×1000W×ΔTb=3.9×0.5143×10000.323×35=177.42 g/mol

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