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CHM1046 Spring 2008 Practice Exam II

# CHM1046 Spring 2008 Practice Exam II - CHM1046 Spring 2008...

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CHM1046 Spring 2008 Practice Exam II Show all work for full credit; Circle or write in final answers when appropriate. Name: ______________________________ Rec. Sec#: _____________ 1) What is the molality of 13.82% by mass sulfuric acid? The molar mass of H 2 SO 4 is 98.08 g/mol. Answer: ___________ a. 0.1409 m b. 1.409 m c. 1.635 m d. 13.55 m e. 15.73 m 2) Determine the heat of solution of NaOH given the thermodynamic equations below. Na(s) + ½ O 2 (g) + ½ H 2 (g) NaOH(s) H o f = -425.9 kJ/mol Na(s) + ½ O 2 (g) + ½ H 2 (g) NaOH(aq, 1 m ) H o f = -469.2 kJ/mol Answer: _______________ a. -895.1 kJ/mol b. -43.3 kJ/mol c. +1.102 kJ/mol d. +43.3 kJ/mol e. +895.1 kJ/mol 3) The Henry’s Law constant for N 2 in water at 37 o C is 8.2 x 10 -7 M/mmHg. What is the equilibrium concentration of N 2 in water when the partial pressure of N 2 is 634 mmHg? Answer: _____________ a. 1.3 x 10 -9 M b. 5.2 x 10 -4 M c. 1.9 x 10 -2 M d. 1.9 x 10 3 M e. 7.7 x 10 8 M

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4) Ideally, colligative properties depend only on the ___________________ a. concentration of solute particles in a solution. b. identity of the solute particles in a solution. c. color of a solution. d. hydrated radii of the molecules or ions dissolved in a solution. e. partial pressure of the gases above the surface of a solution.
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CHM1046 Spring 2008 Practice Exam II - CHM1046 Spring 2008...

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