Answered: What is the molality of a solution…

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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1) What is the molality of a solution prepared by dissolving 78.8 g of ethylene glycol, HOCH₂CH₂OH, in 1.45 L of water? Assume the density of water is 1.00 g/mL.

2)The concentrations of Al and K in a sample of riverwater are 0.0500 mg/kg and 1.30 mg/kg, respectively. Express the concentration in molality.

What molality of nonvolatile solute is needed to lower the melting point of camphor by 1.050°C? (K_f= 39.70ºC/m)

4) Determine the melting point of an aqueous solution containing 193 mg of saccharin (C₇H₅O₃NS) added to 1.00 mL of water (density of water = 1.00 g/mL, K_f = 1.86°C/m).

5) Which one of the following aqueous solutions should have the lowest freezing point?

a. 0.0150 m Na₂SO₄

b. 0.0300 m KBr

c. 0.00500 m C₆H₁₂O₆

_{5) From your predicted value of the van't Hoff factor, calculate the boiling point of a 1.64 m aqueous solution of barium nitrate, Ba(NO3)2. The Kb of water is 0.52°C/m.}

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