Solutions Question 75

Question: 1.00 gm of a non-electrolyte solute dissolved in 50 gm of benzene lowered the freezing point of benzene by 0.40 K. Kf for benzene is 5.12 kg mol-1. Molecular mass of the solute will be [DPMT 2004]

Options:

A) 256,g,mol1

B) 2.56,g,mol1

C) 512×103,g,mol1

D) 2.56×104,g,mol1

Show Answer

Answer:

Correct Answer: A

Solution:

By using, m=Kf×1000×wΔTf×WSolvent,(gm)

=5.12,×1000×10.40×50

=256,gm/mol Hence, molecular mass of the solute =256,gm,mol1



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