Exam2_S10_review_KEY

Exam2_S10_review_KEY - Chem XXI Exam II Study Tool KEY...

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Chem XXI Exam II Study Tool- KEY Spring 2010 Acid Rain 1) Sulfur dioxide dissolves in water droplets in the atmosphere and reacts according to the equation SO 2 (aq) + 2 H 2 O (l) HSO 3 ¯(aq) + H 3 O + (aq) HSO 3 ¯(aq) then reacts slowly with oxygen according to the following 2 HSO 3 ¯(aq) + O 2 (aq) + 2 H 2 O(l) 2 SO 4 2- (aq) + 2 H 3 O + (aq) The mechanism for this second reaction has recently been found to be: 2 HSO 3 ¯(aq) + O 2 (aq) S 2 O 7 2- (aq) + H 2 O (l) (fast, equilibrium) S 2 O 7 2- (aq) + 3 H 2 O (l) 2 SO 4 2- (aq) + 2 H 3 O + (aq) (slow) a) What is the rate law for the second reaction ? Rate = k[O 2 ][ HSO 3 ¯] 2 water is left out because it is assumed that it much higher concentration than the other molecules making it pseudo zero order. b) Assume the second reaction has a positive ∆G. Draw a reaction coordinate diagram for the mechanism. Label the transition states and the location of any intermediates. E a1 E a2 G Reaction Progress intermediate c) This reactions equilibrium constant decreases with increasing temperature. Given this, what is the sign on the enthalpy of reaction? Can you provide a kinetic and thermodynamic argument to support your answer? Exothermic.
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This note was uploaded on 03/29/2010 for the course CHEM 152 taught by Professor Grall during the Spring '08 term at Arizona.

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Exam2_S10_review_KEY - Chem XXI Exam II Study Tool KEY...

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