In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg 1. What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)? 2. How many moles of solute is present in the solution given in the situation?

In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 mL of acetone (C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath. The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of acetone = 1.67 degC/kg 1. What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)? 2. How many moles of solute is present in the solution given in the situation?

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.17QE

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Question

In the determination of molar mass of an unknown substance by ebullioscopic constant, 30 ml of acetone
(C3H6O) was placed in a test tube with thermometer and glass tubing and subjected to water bath. Upon
boiling, the temperature reads 56 deg C. For the boiling point of unknown-acetone solution, you prepared
the solution by mixing 1.60 g of unknown solute in the 30 mL acetone and subjected it again to water bath.
The boiling temperature of the solution is 56.68 deg C. The density of acetone = 0.9849 g/mL and the Kb of
acetone = 1.67 degC/kg
1. What is the value for delta Tb or the change in boiling temperature (in degrees Celsius)?
2. How many moles of solute is present in the solution given in the situation?

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