PS6KEYF07 - Chemistry 391 PS6 KEY Fall 2007 1. The...

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1 Chemistry 391 Fall 2007 PS6 KEY 1. The formation reaction 24 C(s)+2H (g) CH (g) is listed in the table and has the value 0 ,298 1kcal/mol 74.81kJ/mol= 74.81kJ/mol* 17.88 4.184 kJ/mol f H ⎛⎞ Δ= = ⎜⎟ ⎝⎠ kcal/mol. And from adding up the three reactions in the problem statement: ( ) () 00 0 12 3 2 212.8 94.05 2 68.32 kcal/mol 17.89 kcal/mol HH H −Δ + Δ = = − Close enough! 2. a) 4NH 3 ( g ) + 6NO( g ) 5 N 2 ( g ) + 6H 2 O( g ) ( ) ( ) ( ) 22 3 -1 -1 -1 -1 -1 -1 - 5 N , 6 H O, 4 NH , 6 NO, 0 6 241.8kJ mol 4 45.9kJ mol 6 91.3kJ mol 1815.0kJ mol 1815.0kJ mol 5 6 4 6 8.314 J K mol reaction f f f f reaction reaction g H g H g H g UHn R T Δ + Δ Δ Δ =−× −× =− Δ− Δ + + DD D D D 1- 1 298.15 K 1817.5kJ mol ×= b) 2NO( g ) + O 2 ( g ) 2NO 2 ( g ) ( ) ( ) () ( ) -1 -1 -1 -1 -1 -1 -1 2N O , O , O , 2 33.2kJ mol 0 2 91.3kJ mol 116.2kJ mol 116.2kJ mol 2 2 1 8.314J K mol 298.15K 113.7kJ mol reaction f f f reaction reaction g H g H g R T Δ Δ Δ −−× Δ + × D D 3. The desired overall reaction can be related to the individual reactions for which the data are given as follows: CH 3 COOH( l ) + 2O 2 ( g ) 2H 2 O( l ) + 2CO 2 ( g ) ( ) 298 K reaction H Δ D = –871.5 kJ mol -1 CH 3 COOH( g )
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This note was uploaded on 07/25/2008 for the course CEM 391 taught by Professor Cuckier during the Fall '08 term at Michigan State University.

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PS6KEYF07 - Chemistry 391 PS6 KEY Fall 2007 1. The...

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