CHE 102LLR Study Guide - Final Guide: Solution Process, V12 Engine, Rate Equation

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CHEM 102/112 Exam #1
March 3rd
2017 (1 hr 30 min)
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Name: _______________________________________
2
1. Consider the following pairs of liquids. Which pairs are miscible?
I. Benzene, C6H6, and Hexane, C6H14
II. Water and Methanol, CH3OH
III. Water and Hexane
A) I & II only C) I only E) I, II & III
B) II only D) III only
2. What are the ideal van’t Hoff factors for the following compounds?
BaF2 C6H12O6 K3PO4 (NH4)2SO4
A) 1, 1, 1, 1
B) 3, 1, 4, 1
C) 3, 1, 4, 3
D) 2, 3, 5, 5
E) None of the above
3. A solution made by dissolving 9.81 g of a nonvolatile nonelectrolyte in 90.0 g of water
boiled at 100.37 C and 760.1 mmHg. What is the approximate molecular weight (in g/mol)
of the nonelectrolyte substance?
A) 240
B) 150
C) 79
D) 61
E) 34
4. At 20. C and 1.00 atm of partial pressure of O2, the solubility of O2 in water is 1.38x103 M.
At sea level however, the partial pressure of O2 is 0.21 atm. Calculate the concentration (M)
of O2 in water at sea level.
A) 1.4x103
B) 6.6x103
C) 2.9x104
D) 0.21
E) None of these answers are correct
Substance
Normal Boiling
Point (°C)
Kb
(°C/m)
Normal Freezing
Point (°C)
Kf
(°C/m)
Water 100.00 0.51 0.00 1.86
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Name: _______________________________________
3
5. (Hw): During the formation of a solution, which step is always an exothermic process?
A) Only the separation of solvent particles to accommodate solute particles (Hsolvent).
B) The mixing of solute particles and solvent particles with one another (Hmix).
C) The overall solution process (HSoln).
D) Only the separation of solute particles from one another (Hsolute).
E) The separation of solute and solvent particles from one another (Hsolute and Hsolvent).
6. A solution is prepared by dissolving 23.7 g of aspirin, C9H8O4, in 375 g of water. The
density of the resulting solution is 1.05 g/mL. What is the molar concentration of aspirin?
A) 0.347
B) 0.35
C) 54.7
D) 878
E) 0.063
7. Of the concentration units below, only __________ is temperature dependent.
A) mass%
B) ppm
C) mole fraction
D) molarity
E) molality
8. What is the osmotic pressure (in atm) of a solution formed by dissolving 25.0 mg of CaCl2,
in 250. mL of water at 25 C?
A) 7.34
B) 9.01x104
C) 0.0661
D) 0.0220
E) 2.25x104
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Document Summary

March 3rd 2017 (1 hr