# Wright CHM 1220 - CHM 1220_SI_Kinetics_Fall2017_answers (2 pages)

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## CHM 1220_SI_Kinetics_Fall2017_answers

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- Course:
- Chm 1220 - General Chemistry II

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CHM 1220 SI Activity Kinetics ANSWERS Fall 2017 1 Given the following data determine the rate law and estimate the rate constant BrO3 aq 5 Br aq 6 H aq 3 Br2 aq 3 H2O H M Experiment BrO3 M Br M Rate M s 1 0 100 0 100 0 100 1 20 10 3 2 0 200 0 100 0 100 2 40 10 3 3 0 100 0 300 0 100 3 60 10 3 4 0 200 0 100 0 150 5 40 10 3 From Experiments 1 2 Br H constant rate doubles BrO3 doubles first order with respect to BrO3 From Experiments 1 3 BrO3 H constant rate triples Br triples first order with respect to Br From Experiments 2 4 BrO3 Br constant rate times 2 25 H times 1 5 second order with respect to H Rate law 2 40 10 3 log 5 40 10 3 0 352 reaction order H 2 0 176 0 100 log 0 150 Rate k BrO3 Br H 2 Using data from any experiment k Rate BrO Br H 3 2 The reaction 2 1 20 10 3 M s 1 12 0 M 3 s 1 2 0 100 M 0 100 M 0 100 M CO g NO2 g CO2 g NO g was studied at 25 C and the following data were obtained Experiment 1 2 3 4 CO 0 M 5 0 10 4 5 0 10 4 1 0 10 3 1 5 10 3 NO2 0 M 0 36 10 4 0 18 10 4 0 36 10 4 0 72 10 4 Initial Rate M hr 3 4 10 8 1 7 10 8 6 8 10 8 a What is the rate law for this reaction at 25 C including the value of the rate constant From Experiments 1 2 CO constant rate halved NO2 halved first order with respect to NO2 From Experiments 1 3 NO2 constant rate doubled CO doubled first order with respect to CO Rate law Rate k CO NO2 Using data from any experiment Rate 3 4 10 8 M hr 1 k 1 89 M 1hr 1 4 4 CO NO2 5 0 10 M 0 36 10 M b What is the initial rate of the reaction for experiment 4 Rate k CO NO2 1 89M 1hr 1 1 5 10 3 M 0 72 10 4 2 04 10 7 M hr CHM 1220 SI Activity Kinetics 3 A reaction of the form Fall 2017 aA Products gives a plot of ln A versus time in seconds which is a straight line with a slope of 7 35 10 3 Assuming A 0 0 0100 M calculate the time required for the reaction to reach 22 9 completion Plot information indicates that the reaction is first order rate law Rate k A indicates Calculate time to reaction to proceed to 22 9 reacted ln A kt ln A 0 first order integrated rate law slope k 7 35 10 3 k 7 35 10 3 s 1 77 1 remains A 0 771 A 0 ln 0 771 A 0 kt ln A 0 ln 0 771 kt t ln 0 771 35 4 s 7 35 10 3 s 1 4 You and a coworker have developed a molecule that has shown potential as cobra antivenin AV This antivenin works by binding to the venom V thereby rendering it nontoxic This reaction can be described by the rate law Rate k AV V You have been given the following data from your coworker where V 0 is much greater than AV 0 V 0 0 20 M and AV 0 1 0 10 4 M A plot of ln AV versus t s gives a straight line with a slope of 0 32 s 1 What is the value of the rate constant k for this reaction Plot information indicates that the data was collected under pseudo first order conditions pseudo first order rate law first order integrated rate law Rate k AV where Plug in and solve k k V 0 ln AV k t ln AV 0 indicates slope k 0 32 s 1 k 0 32 s 1 k k V 0 k 0 32 s 1 k V 0 0 20 M k 1 6 M 1 s 1

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