Chem 102 Spring Exam 1 - Name_Mr Perfect Date_Sp 14 1...

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Name ___Mr. Perfect ___________________________________________ Date ____Sp 14 __________ Chemistry 102 Exam 1 1. Consider the following reaction between nitrite ion and ozone: NO 2 - + O 3 NO 3 - + O 2 From the following data, determine the rate law for the reaction, state the overall order of the reaction and calculate the rate constant for the reaction (include proper units for full credit). (15 pts) rate = k[NO 2 - ] x [O 3 ] y Trial [NO 2 - ] (M) [O 3 ] (M) Initial Rate (M/s) 1 0.0100 0.0050 25 2 0.0150 0.0050 37.5 3 0.0200 0.0050 50.0 4 0.0200 0.0200 200.0 Dependence on [NO 2 - ] Dependence on [O 3 ] x = 1 1 st order in [NO 2 - ] x = 1 1 st order in [O 3 ] rate = k[NO 2 - ][O 3 ] 2 nd order overall 2. A proposed mechanism for the decomposition of hydrogen peroxide consists of three elementary steps shown below. Write the overall equation for the decomposition of hydrogen peroxide and determine which step is the slow step in the reaction if the observed rate law is first order in hydrogen peroxide. (10 pts) rate = k[H 2 O 2 ] Proposed Mechanism Step 1: H 2 O 2 2OH (slow step) 1 st order in [H 2 O 2 ] Step 2: H 2 O 2 + OH H 2 O + HO 2 Step 3: HO 2 + OH H 2 O + O 2 ___________________________ overall 2H 2 O 2 2H 2 O + O 2
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Name ___Mr. Perfect
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