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mq2b - 1(6 pts In the following reaction 2 MnO4(aq 5 H2O2(R...

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235 92 U 1. (6 pts) In the following reaction 2 MnO 4 - (aq) + 5 H 2 O 2 ( R ) + 6H + (aq) 6 2 Mn 2+ (aq) + 8 H 2 O( R ) + 5 O 2 (g) the concentration of MnO 4 - dropped from 0.5684 M to 0.5522 M in 2.23 minutes. What was the average rate of formation of O 2 , in M/min, during this time interval? a) 2.14 x 10 -3 b) 1.82 x 10 -2 c) 2.09 x 10 -2 d) 6.37 x 10 -2 e) 8.50 x 10 -1 2. (5 pts) Concentration and time data is obtained for a reaction. Which of the following statements is incorrec t about the reaction? a) If R n[A] t is plotted against time and the graph gives a straight line, the reaction was first order with respect to A. b) The half-life of a first order reaction is a constant. c) When 1/[A] t is graphed against time, the slope of the line is equal to the rate constant for a second order reaction. d) The half-life of a second order reaction decreases as the concentration of the reactants decrease. e) The rate of reaction at a specific time can be determined from the slope of the line tangent to the curve at that time on a graph of concentration versus time. 3. (5 pts) The half-life of , a naturally radioactive isotope is 7.1 x 10 8 years. Radioactive decay is a first-order kinetic reaction. Calculate the rate constant for the radioactive decay of U-235. (1) The initial rate of a hypothetical reaction 3A + B 6 2C
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was measured at different concentrations of A and B. The results are summarized below: Experiment Number Initial Concentration [A] Initial Concentration [B] Initial Rate of Reaction M/s 1 1.20 M 0.50 M 1.08 x 10 -1 2 0.40 M 0.50 M 1.2 x 10 -2 3 1.20 M 1.00 M 1.08 x 10 -1 4 0.72 M 0.48 M ? Questions 4 - 6 refer to this reaction. 4. (6 pts) The rate law for the reaction is 5. (5 pts) The numerical value of the rate constant for this reaction is
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