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Calculate molal depression constant of water if latent heat of fusion of ice at $0^\circ \text C$ is $80 \text{ cal/g}$.

All I could find was the equation $K_f=\frac{0.002T^2}{L_f(\text{in cal/g})}$ at http://www.sciencehq.com/chemistry/depression-of-freezing-point.html

How was this equation derived?

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  • $\begingroup$ Any physical chemistry textbook will have this derivation. In my copy of Moore's Physical Chemistry (amazon.co.uk/Physical-Chemistry-W-J-Moore/dp/0582442346/… - apparently now out of print) it's on pages 247-249. $\endgroup$ – John Rennie Aug 23 '13 at 7:38
  • $\begingroup$ Could you tell me what that equation is actually called? $\endgroup$ – user80551 Aug 23 '13 at 17:36
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I've uploaded the derivation. I'm using Cengage Physical Chemistry. This book is recommended by my highschool teacher.

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