1B-S10-Quiz-7-v1-all

1B-S10-Quiz-7-v1-all - 2 are all 1.00 atm, is this reaction...

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Chem 1B Quiz 7- Useful Information G° = H° - T G° = - RT ln K G = G° + RT ln Q S = q T /T R = 8.314 J/mol•K Standard Thermodynamic Data at 25°C Substance H f ° (kJ/mol) G f ° (kJ/mol) S° (J/K•mol) PbCl 2 (s) - 359.4 - 314.1 136 PbBr 2 (s) - 277.4 - 260.7 161.1 Pb 2+ (aq) - 1.7 - 24.39 10.5 Cl - (aq) - 167.2 - 131.3 56.5 Br - (aq) - 121.5 - 104.0 82.4
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Quiz 7 Name: Chem 1B, Spring 10 Fossum 1. (2) Predict the sign of S for the following reaction and explain your reasoning clearly. Pb 2+ (aq) + CO 3 2- (aq) PbCO 3 (s) 2. 2 SO 3 (g) 2 SO 2 (g) + O 2 (g) G° = 12.1 kJ at 700.°C a. (1) When the partial pressures of SO 3 , SO 2 , and O
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Unformatted text preview: 2 are all 1.00 atm, is this reaction spontaneous or nonspontaneous? How can you tell? b. (4) Calculate ∆ G at 700.°C if P SO3 = 2.0 atm, P SO2 = 0.10 atm, and P O2 = 0.030 atm. c. (1) Is the reaction spontaneous or nonspontaneous under the conditions described in part b? How can you tell? d. (2) For this reaction, ∆ H° = 196.6 kJ and ∆ S° = 189.6 J/K. Calculate the temperature at which this reaction would become spontaneous under standard conditions. 3. (10) Using thermodynamic values, calculate the solubility of PbCl 2 in water at 52°C (in units of g/L). Hint: write the K sp reaction....
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This note was uploaded on 09/04/2011 for the course CHEM 1B taught by Professor Fossum during the Spring '10 term at Laney College.

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1B-S10-Quiz-7-v1-all - 2 are all 1.00 atm, is this reaction...

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