If latent heat of fusion of ice is 80 cals per g at 0 o C , calculate molal depression constant for water.

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Question: Answered & Verified by Expert

If latent heat of fusion of ice is 80 cals per

g

at

0^{o} C

, calculate molal depression constant for water.

ChemistrySolutionsJEE Main

Options:

A 18.63
B 186.3
C 1.863
D 0.1863

Solution:

2510 Upvotes Verified Answer

The correct answer is: 1.863

K_{f} = \frac{R T_{f}^{2}}{1000 \times l_{V}}

Here

R = 2 c a l s

,

T_{f} = 0 + 273 = 273, l_{f} = 80 c a l s

K_{f} = \frac{2 \times 273 \times 273}{1000 \times 80} = 1.863

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