Exam2-152A&B-Sp16-VerB&D-KEY

The combustion of ethane c 2 h 6 is shown below 2 c 2

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19. The combustion of ethane (C 2 H 6 ) is shown below. 2 C 2 H 6 ( g ) + 7 O 2 ( g ) 4 CO 2 ( g ) + 6 H 2 O( l ) At 25°C, o rxn H = –1560 kJ mol –1 for this reaction, 2 CO ( ) o f H g = –394 kJ mol –1 , and 2 H O( ) o f H l = –286 kJ mol –1 . Calculate o f H for ethane. Constant volume entropy: ln 3 8.314 J 26 273 6.00 mol ln 2 mol K 232 273 = 39.2 J/K f V i T S nC T S    3 1 1 1 At the phase change temperature, 0 8.5 10 J mol 177 K 95.9 C 48.0 J mol K sys sys univ sys surr sys sys sys H H S S S T T S H T S          2 2 2 6 2 , CO , H O , C H , O 4 6 2 7 o o o o o rxn f f f f H H H H H      2 6 2 2 2 6 , C H , CO , H O 1 1 , C H 1 4 6 2 1 = 1560 4 394 6 286 kJ mol 2 86.6 kJ mol o o o o f rxn f f o f H H H H H            
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UW VERSION B CHEM 152A, Sp16 EXAM 2 VERSION B Page 9 of 9
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