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 $
