Review Problems for 2nd midterm

Review Problems for 2nd midterm - Chem 1B: Review Problems...

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1 Chem 1B: Review Problems for Midterm 2 1) Using thermodynamic data from Appendix 4, calculate G ° for the following process where all gases are at 1.00 atm pressure. 2 SO 2 ( g ) + O 2 ( g ) 2 SO 3 ( g ) -142 kJ Also calculate G at 25°C for this same reaction but with all gases at 10.0 atm pressure. - 148 kJ 2) Using data from Appendix 4, calculate H °, S °, and K (at 298 K) for the synthesis of ammonia by the Haber process. N 2 ( g ) + 3 H 2 ( g ) 2 NH 3 ( g ) Δ H ° = -92 kJ Δ S ° = -199 J/K K = 9.11 × 10 5 Calculate G for this reaction under the following conditions. Assume that H ° and S ° do not depend on temperature. T = 287 K, P N2 = P H2 = 170 atm, P NH3 = 50. atm Δ G = -64.35 kJ 3) Consider the following reaction at 298 K. 2 SO 2 ( g ) + O 2 ( g ) 2 SO 3 ( g ) An equilibrium mixture contains O 2 ( g ) and SO 3 ( g ) at partial pressures of 0.50 atm and 2.0 atm, respectively. Using data from Appendix 4, determine the equilibrium partial pressure of SO 2 (P SO2 ) in the mixture. P SO2 = 1.02 x 10 -12 atm Will this reaction be favored at a high or a low temperature, assuming standard conditions? - high temperature - low temperature 4) Consider only the species below (at standard conditions) in answering the following questions. (Use data from Table 11.1 .) Na + , Cl - , Ag + , Ag, Zn 2+ , Zn, Pb (a) Which is the strongest oxidizing agent? (_) Na + (_) Cl - (_) Ag + (_) Ag (_) Zn 2+ (_) Zn (_) Pb Give reasons for your answers.
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(b) Which is the strongest reducing agent? (_) Na + (_) Cl - (_) Ag + (_) Ag (_) Zn 2+ (_) Zn (_) Pb Give reasons for your answers. (c) Which species can be oxidized by SO 4 2- ( aq ) in acid? (Select all that apply.) [_] Na + [_] Cl - [_] Ag + [_] Ag [_] Zn 2+ [_] Zn [_] Pb Give reasons for your answers. (d) Which species can be reduced by Al( s )? (Select all that apply.) [_] Na + [_] Cl - [_] Ag + [_] Ag [_] Zn 2+ [_] Zn [_] Pb Give reasons for your answers. 5) Consider the following galvanic cell at 25°C. Pt | Cr
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This note was uploaded on 03/14/2010 for the course CHEM 109A 109A taught by Professor Aue during the Spring '09 term at UCSB.

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Review Problems for 2nd midterm - Chem 1B: Review Problems...

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