3. 5.00 g of an organic solid is dissolved in 100.0 g of benzene. The boiling temperature of this solution is 82.42°C. What is the molar mass of the organic solid? (benzene, boiling pt. = 80.10°C, Kb = 2.53°C/m)

3. 5.00 g of an organic solid is dissolved in 100.0 g of benzene. The boiling temperature of this solution is 82.42°C. What is the molar mass of the organic solid? (benzene, boiling pt. = 80.10°C, Kb = 2.53°C/m)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

3 & 4

Learning Task 8: Solve the following problems. Show your complete solution.
1. Nicotine, extracted from cigarettes, is a liquid completely miscible with water at
temperatures below 60°C. What is the molality of nicotine in an aqueous solution that
starts to freeze at -0.560°C? (H2O, K = 1.86°C/m)
2. What is the normal boiling point of the following solutions? (a) 23.5 g NaCl in 120
g H₂0 and (b) 15.4 g urea, CO(NH2)2, in 70 g H₂O. (H2O, Kb = 0.512°C/m)
3. 5.00 g of an organic solid is dissolved in 100.0 g of benzene. The boiling
temperature of this solution is 82.42°C. What is the molar mass of the organic solid?
(benzene, boiling pt. = 80.10°C, Kb = 2.53°C/m)
4. A solution of 2.50 g of a compound having the empirical formula C6H5P in 25.0 g
of benzene is observed to freeze at 4.3°C. Calculate the molar mass of the solute and
its molecular formula. (benzene, freezing pt. = 5.50°C, K₁= 4.90 °C/m)
5. If 112.9 g of urea, CO(NH2)2, is added to 450.0 g of H₂O to form a solution with a
temperature of 30°C, what is the solution's vapor pressure? (vapor pressure of H₂O at
30°C 31.8 mmHg)
6. A solution is prepared by dissolving 20.3 g glucose, C6H12O6, in enough water to
make a 250 mL solution. What is the solution's osmotic pressure at 25°C?

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