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Unformatted text preview: ) 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 H o for the reaction? b. What is S o for the reaction? c. Using H o and S o , find G , Is the reaction spontaneous ( circle one ) YES NO IT IS AT EQUILIBRIUM d. What is G at 400 o C. 5. Calculate K at 25C for sulfurous acid: H 2 SO 3 ( aq ) <==> H + ( aq ) + HSO 3-( aq ) 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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- Spring '08