1 - C at constant atmospheric pressure in a thermally...

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villanueva (jcv746) – 20 Thermodynamics: Second and Third Laws – scott – (APCHEM) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Calculate the standard entropy change For the oxidation oF ammonia (the frst step in the commercial production oF nitric acid): 4 NH 3 (g) + 5 O 2 (g) 4 NO(g) + 6 H 2 O( ) at 25 C. S NH 3 (g) 192.45 J K · mol O 2 (g) 205.14 J K · mol NO(g) 210.76 J K · mol H 2 O( ) 69.91 J K · mol Answer in units oF J K · mol 002 10.0 points What is the entropy change For the vapor- ization oF 3 mol H 2 O( ) at 100 C and 1 atm? Δ H = 40700 J / mol. Answer in units oF J / K 003 10.0 points Calculate the standard reaction entropy For the Formation oF 1 mol H 2 O( ) From the el- ements in their most stable state at 298 K iF S H 2 O( ) 69.91 J K · mol H 2 (g) 130.68 J K · mol O 2 (g) 205.14 J K · mol Answer in units oF J K · mol 004 10.0 points Suppose that 145 g oF ethanol at 26 C is mixed with 275 g oF ethanol at 84
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Unformatted text preview: C at constant atmospheric pressure in a thermally insulated vessel. What is the S sys For the process? The specifc heat capacity For ethanol is 2.42 J/g K. Answer in units oF J / K 005 (part 1 of 2) 10.0 points Calculate the standard entropy change For the dissolution oF Ca 2 in water: Ca 2 (s) Ca 2 (aq) at 298 K, iF S H f ( J K mol ) ( kJ mol ) Ca 2 (s) 68.87-1219 . 6 Ca 2 (aq)-80 . 8-1208 . 09 Answer in units oF J K mol 006 (part 2 of 2) 10.0 points Using the given data, what is the standard Free-energy change? Answer in units oF kJ / mol 007 10.0 points Calculate G For the Following reaction. 4 X Y + 3 Z 2- 2 Z 3 X 2 + 2 Y 2 Substance H f S kJ/mol J/mol K XY 202 . 73 . Y 2-82 . 37 . Z 2-25 . 78 . Z 3 X 2-245 . 137 . Answer in units oF kJ / mol...
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This note was uploaded on 10/29/2011 for the course CHE 101 taught by Professor Scoot during the Spring '11 term at Davidson.

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