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Q.

The amount of urea to be dissolved in 500 cc of water (Kf=1.86) to produce a depression of 0.186oC in the freezing point is:

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a

9 g

b

6 g

c

3 g

d

0.3 g

answer is C.

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Detailed Solution

ΔTf=Kf×wB×1000mB×wA0.186=1.86×wB×100060×500     wB=3 g
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