Practice Test _3

Practice Test _3 - Exam #3 Chemistry 112 Spring 2009 Name:...

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1 Exam #3 Chemistry 112 Spring 2009 Name: _______________________________ Last 4 Digits of your ID number: _______ Show all work!!! Circle the final answer in each problem!!! Be sure to clearly indicate + and – signs for your final answer.
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2 1) 10 points. Given the following thermodynamic data, calculate the boiling point of phosphorous trichloride, PCl 3 . Δ f (25°C) kJ/mol. Δ S° (25°C) J/mol. Δ f (25°C) kJ/mol PCl 3 ( l ) -319.7 217.18 -272.3 PCl 3 (g) -287.0 311.78 -267.8 Assume that Δ H and Δ S do not change with temperature. 2) 10 points. Calculate the amount of work done when 100 liters of an ideal gas originally at a pressure of 1 atm is compressed to a final volume of 10 liters and a final pressure of 10 atm.
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3 3) 10 points. When a 5 g sample of aluminum powder (MW = 27g/mol) reacts with iron oxide, Fe 2 O 3 , in a bomb calorimeter according to the reaction: 2 Al (s) + Fe 2 O 3 (s) Al 2 O 3 (s) + 2 Fe (s) the temperature rises by 8.3 °C. The heat capacity of the calorimeter is 22.3 kJ/°C. a) Calculate Δ E for the reaction of 1.00 mol of aluminum powder in kJ/mol. b) Calculate Δ H for this reaction at 298 K in kJ/mol.
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4 4) 10 points. Calculate the equilibrium constant for the following reaction at 298 K and 1 atm of pressure. 2 H 2 O ( l ) >>> H 3 O + (aq) + OH - (aq) Δ f (25°C) kJ/mol. Δ S° (25°C) J/mol. Δ f (25°C) kJ/mol H 2 O ( l ) -285.83 69.91 -237.18 H 3 O + (aq) -285.83 69.91 -237.18 OH - (aq) -229.99 -10.75 -157.32
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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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Practice Test _3 - Exam #3 Chemistry 112 Spring 2009 Name:...

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