Exam_1-2009 - Exam #1 Chemistry 112 Spring 2009 Name: _...

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1 Exam #1 Chemistry 112 Spring 2009 Name: _______________________________ Last 4 digits of Student ID Number: __________________ Section #:___________ Show All Work !
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2 1. (6 points) List all the intermolecular forces present in a) chloroform (CHCl 3 ) b) Ethanol (CH 3 CH 2 OH) c) Iodine (I 2 ) 2. (8 points) A solution contains 1.0 g of sucrose (MW = 342.3 g/mol) dissolved in 20 g of water. The freezing point depression constant of water is 1.86 °C/m. Calculate the freezing point of the solution. 3. (10 points) You have a 2 M solution of NaCl (aq). Density = 1.2 g/mL. Express the concentration of this solution in weight percent. (MW of NaCl = 58.44g/mol)
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3 4. (6 points) The equilibrium constant for the reaction N 2 (g) + 3 H 2 (g) 2 NH 3 (g) equals K c = 0.4 at 400 °C. Calculate K c for BOTH of the following TWO reactions: a) 1/2 N 2 (g) + 3/2 H 2 (g) NH 3 (g) b) 2NH 3 (g) N 2 (g) + 3 H 2 (g) 5. (4 points) Sulfur trioxide (SO 3 ) is placed in a container and allowed to equilibrate. The reaction SO 3 (g) SO 2 (g) + ½ O 2 (g) is endothermic. In which direction (Left to Right; or Right to Left; or No Change) will the reaction go: a) if additional SO 2 is added to the system?
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This note was uploaded on 02/21/2012 for the course CHEM 112 taught by Professor Chen during the Spring '09 term at South Carolina.

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Exam_1-2009 - Exam #1 Chemistry 112 Spring 2009 Name: _...

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