Solutions Question 382

Question: The freezing point of a solution composed of 10.0 g of KCl in 100 g of water is $ 4.5{}^\circ C $ . Calculate the van’t Hoff factor, i for this solution.

Options:

A) 2.50

B) 1.8

C) 1.2

D) 1.3

Show Answer

Answer:

Correct Answer: B

Solution:

$ \Delta T_{f}=iK_{f}m $ $ m=\frac{100g/kg,H_2O}{74.55,g/mol,(1.34,m)}=1.8 $

$ i=\frac{\Delta T_{f}}{K_{f}m}=\frac{{{4.5}^{o}}C}{({{1.86}^{o}}C/m),(1.34,m)}=1.8 $



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