Unformatted text preview: ) Æ 6CO 2 ( g ) + 3H 2 O( l ) 4. Given the following data for the reaction: 3 Cl 2 ( g ) + 2 CH 4 ( g ) ± CH 3 Cl( g ) + CH 2 Cl 2 ( g ) + 3 HCl( g ) H f ° (kJ/mol) 0.00 -74.81 -80.83 -92.47 -92.31 S° (J mol- 1 K-1 ) 223.1 186.3 234.6 270.2 186.9 a. What is Δ H o for the reaction? b. What is Δ S o for the reaction? c. Using Δ H o and Δ S o , find Δ G , Is the reaction spontaneous ( circle one ) YES NO IT IS AT EQUILIBRIUM d. What is Δ G at 400 o C. 5. Calculate K at 25°C for sulfurous acid: H 2 SO 3 ( aq ) <==> H + ( aq ) + HSO 3-( aq ) Δ H f ° (kJ/mol) -608.8 0 -626.2 S ° (J/mol K) 232.2 0 139.8 Which thermodynamic factor is the most significant in accounting for the fact that sulfurous acid is a weak acid? 6. Identify all the sign combinations of D H and D S that are possible for a process carried out at constant temperature and pressure. Determine whether each possibility is spontaneous, nonspontaneous, or whether both situations are possible. Explain....
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This note was uploaded on 09/30/2011 for the course CHEM 1220 taught by Professor Barber during the Spring '08 term at Wayne State University.
- Spring '08