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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