Exam2_S10_review

Exam2_S10_review - Chem XXI Exam II Study Tool Spring 2010...

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Chem XXI Exam II Study Tool 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 ? 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. 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? d)
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Exam2_S10_review - Chem XXI Exam II Study Tool Spring 2010...

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