Q.

Bromoform has a normal freezing point of 7.734oC/m and it's Kf =14.4oC/m. A solution of 2.60 g of an unknown in 100 g of bromoform freezes at 5.43oC. What is the molecular weight of the unknown?

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a

16.25

b

162.5

c

100

d

none of these

answer is B.

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Detailed Solution

ΔTf=2.304; m=2.30414.4⇒0.16m=nsolute Wsolvent ×10000.16=2.6M×1000100;M⇒162.5
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