worksheet assignment2 chem122 - Name Philip M Oum College ID 0513170 Thomas Edison State University General Chemistry II with Labs(CHE-122 Section no

worksheet assignment2 chem122 - Name Philip M Oum College...

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Name: Philip M. Oum College ID: 0513170 Thomas Edison State University General Chemistry II with Labs (CHE-122) Section no.: 009 Semester and year: July 2017 Written Assignment 2: Physical Properties of Solutions Answer all assigned questions and problems, and show all work. 1. Arrange the following compounds in order of increasing solubility in water: O 2 , LiCl, Br 2 , CH 3 OH (methanol) (4 points) (Reference: Chang 12.11) Answer: O 2 , Br 2 , LiCl, CH 3 OH 2. Calculate the percent by mass of the solute in each of the following aqueous solutions: (12 points) a. 5.50 g of NaBr in 78.2 g of solution b. 31.0 g of KCl in 152 g of water c. 4.5 g of toluene in 29 g of benzene (Reference: Chang 12.15) a) 5.50 100 7.03% 78.2 g g g b) 31.0 31.0 100 100 16.94% 31.0 152 183 g g g g g c) 2 6 2 2 7.20 2.03 3.546 molC H O m kgH O 1 Copyright © 2016 by Thomas Edison State University. All rights reserved.
3. Calculate the molality of each of the following solutions: (8 points) a. 14.3 g of sucrose (C 12 H 22 O 11 ) in 676 g of water b. 7.20 moles of ethylene glycol (C 2 H 6 O 2 ) in 3546 g of water (Reference: Chang 12.17) a) 12 22 11 12 22 11 12 22 11 12 22 11 1 14.3 0.042 342.29648 molC H O gC H O molC H O gC H O 12 22 11 2 0.042 0.062 0.676 molC H O m kgH O b) 2 6 2 2 7.20 2.03 3.546 molC H O m kgH O 4. Calculate the molalities of the following aqueous solutions: (12 points) a. 1.22 M sugar (C 12 H 22 O 11 ) solution (density of solution = 1.12 g/mL) b. 0.87 M NaOH solution (density of solution = 1.04 g/mL) c. 5.24 M NaHCO 3 solution (density of solution = 1.19 g/mL) (Reference: Chang 12.19) a) 1000 1.12 1 1120 1 1 ml g L g L ml 12 22 11 342.29648 1120 1.22 702.40 1 g molC H O mol 1.22 1.74 0.702 mol m kg 1.22 1.74 0.702 mol m kg b) 1000 1.04 1 1040 1 1 ml g L g L ml 39.908 1040 0.87 1005 1 g g mol g mol

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