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Q.

The freezing point of a solution of 2.40 g of biphenyl (C12H10) in 75.0 g of benzene (C6H6) is 4.40oC. The normal freezing point of benzene is 5.50oC. What is the molal freezing point constant (oC/m) for benzene?

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a

5.3

b

5.1

c

4.6

d

4.8

answer is A.

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Detailed Solution

4.4−5.5=Kf2.4/15475×103 ∴Kf=5.3
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The freezing point of a solution of 2.40 g of biphenyl (C12H10) in 75.0 g of benzene (C6H6) is 4.40oC. The normal freezing point of benzene is 5.50oC. What is the molal freezing point constant (oC/m) for benzene?