SolutionHard
Question
A liquid freezes at 7°C and boils at 77°C. If the Kf and Kb values for the liquid are 5.6 and 2.5 deg/molal, respectively, then the ratio of molar latent heat of fusion to molar latent heat of vaporization is
Options
A.1: 1
B.1: 3
C.2: 7
D.7: 3
Solution
$\frac{K_{f}}{K_{b}} = \frac{T_{f}^{o^{2}}/\Delta H_{\text{fus}}}{T_{b}^{o^{2}}/\Delta H_{\text{vap}}} \Rightarrow \frac{\Delta H_{\text{fus}}}{\Delta H_{\text{vap}}} = \left( \frac{T_{f}^{o}}{T_{b}^{o}} \right)^{2} \times \frac{K_{b}}{K_{f}} = \left( \frac{280}{350} \right)^{2} \times \frac{2.5}{5.6} = \frac{2}{7}$
Create a free account to view solution
View Solution FreeMore Solution Questions
Which of the following is not a characteristic property of the polar liquids?...40 ml of 0.1 M ammonia solution is mixed with 20 ml of 0.1 M HCl. What is pH of themixture ?( pkb of ammonia solution is...Freezing point of an aqueous solution is (-0.186)oC. Elevation of boiling point of the same solution is Kb = 0.512 0C, K...There are some of the characteristics of the supersaturated solutionI : Equilibrium exists between solutions and solid s...The ratio of the elevation in boiling points of NaCl solution to that of glucose solution of same molality is nearly (a)...