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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
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
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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?
Transcribed Image Text: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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