Solutions Question 76

Question: 0.440 g of a substance dissolved in 22.2 g of benzene lowered the freezing point of benzene by 0.567oC . The molecular mass of the substance (Kf=5.12oC,mol1) [BHU 2001; CPMT 2001]

Options:

A) 178.9

B) 177.8

C) 176.7

D) 175.6

Show Answer

Answer:

Correct Answer: A

Solution:

m=Kf×w×1000ΔTf×W

=5.12×0.440×10000.567×22.2=178.9



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