The data in any row can be used to calculate the rate

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s –1 H 2 O 2NO + O 2 2NO 2 HNO 2 + HNO 3 2NO + O 2 2NO 2
6. (10) Nitrogen dioxide reacts with carbon monoxide to produce nitrogen monoxide and carbon dioxide. NO 2 (g) + CO(g) NO(g) + CO 2 (g) s A proposed mechanism is: 2 NO 2 (g) < —> NO 3 (g) + NO (g) (fast, equilibrium) NO 3 (g) + CO (g) NO 2 (g) + CO 2 (g) (slow) What is a rate law that is consistent with the proposed mechanism? ] 2
EXAM 1 - Karlin page 3 of 4 (+ EChem-Table) Chem 030.102 / Section 2 NAME____ _________________ February 24, 2012 7. (10) Suppose a galvanic cell is constructed with a standard Zn/Zn 2+ couple in one compartment and a modified hydrogen electrode in the second compartment. The pressure of hydrogen gas is 1.0 atm, but [H + ] in the second compartment is unknown. The cell diagram is as follows: Zn( s )|Zn 2+ ( aq, 1.0 M) || H + ( aq , ? M)|H 2 ( g ,1.0 atm)|Pt( s ) What is the pH of the solution in the second compartment if the measured potential in the cell is 0.26 V at 25 °C? pH = ________________ log ) ]
8. (10) For a given reaction, the activation energy is 21.7 kJ/mol. If the reaction rate constant is 7.4 × 10 –2 M –1 s –1 at 25.0 °C, what is the reaction rate constant at –10.0 °C? ) )
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4 EXAM 1 - Karlin page 4 of 4 (+ EChem-Table) Chem 030.102 / Section 2 NAME____ _________________ February 24, 2012

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