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Exam 4 (Green) - 2008-1

Exam 4 (Green) - 2008-1 - CHEM 188 Spring 2008 Hour Exam...

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CHEM 188 – Spring, 2008 Hour Exam 4 (Green) May 8, 2008 Instructions: Your scantron answer sheet must show your NAME , 7-DIGIT KU ID NUMBER , and LAB SECTION . (Begin these entries at the LEFT end of the space provided.) In answering the questions, be careful to fill in the corresponding circles on the answer sheet according to the number of the question on the exam. USE A SOFT (No. 2) PENCIL . Note that a periodic table of the elements is attached at the end of the exam. Useful information: Gas constant R = 8.314 J K - 1 mol - 1 = 0.0821 L atm K - 1 mol - 1 Avogadro's number N Avo = 6.02 × 10 23 per mole Planck's constant h = 6.626 × 10 - 34 J s Speed of light c = 3.00 × 10 8 m s - 1 Gibbs free energy change G = G o + RT ln Q 1. For the reaction N 2 ( g ) + 3H 2 ( g ) 2NH 3 ( g ) G o = - 33.2 kJ at 298K. What is the standard free energy of formation, G f o , of NH 3 ( g )? A. –33.2 kJ/mol B. –16.6 kJ/mol C. 0 kJ/mol D. 16.6 kJ/mol E. 33.2 kJ/mol 2. Calculate G o at 25 o C for the reaction 2SO 3 ( g ) 2SO 2 ( g ) + O 2 ( g ) given that G o f [SO 2 ( g )] = - 300.4 kJ/mole and G o f [SO 3 ( g )] = - 370.4 kJ/mole at 25 o C. 3. Calculate G o at 298K for the reaction CaCO 3 ( s ) CaO( s ) + CO 2 ( g ) given that H o = 177.8 kJ and S o = 160.5 J/K at 298K. 1

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Exam 4 (Green) - 2008-1 - CHEM 188 Spring 2008 Hour Exam...

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