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15. Chemical Kinetics

Stoichiometric Rate Calculations

15. Chemical Kinetics

Stoichiometric Rate Calculations

Multiple Choice

Using the following data, determine the order of the reaction with respect to [NO₂^–].

Data Table for Three Experiments
Experiment	Initial [NH₄⁺]	Initial [NO₂]	Initial rate (M/s)
Experiment 1	0.24 M	0.10 M	7.2 × 10^-6 M/s
Experiment 2	0.12 M	0.10 M	3.6 × 10^-6 M/s
Experiment 3	0.12 M	0.15 M	5.4 × 10^-6 M/s

Multiple Choice

Using the data below (also from question 6), determine the overall order of the reaction.

Data Table for Three Experiments
Experiment	Initial [NH₄⁺]	Initial [NO₂]	Initial rate (M/s)
Experiment 1	0.24 M	0.10 M	7.2 × 10^-6 M/s
Experiment 2	0.12 M	0.10 M	3.6 × 10^-6 M/s
Experiment 3	0.12 M	0.15 M	5.4 × 10^-6 M/s

Multiple Choice
Write the rate law for the following mechanism:
Step 1: NO₂ + NO₂ → NO₃ + NO (slow)
Step 2: NO₃ → NO + O₂ (fast)
Multiple Choice
The formation of alumina, Al₂O₃, can be illustrated by the reaction below:
4 Al (s) + 3 O₂ (g) → 2 Al₂O₃ (s)
At 750 K it takes 267 seconds for the initial concentration of Al₂O₃ to increase from 6.18 x 10^-5 M to 5.11 x 10^-4 M. What is the average rate of Al?
Multiple Choice
Given the reaction 4 A → 3 B, if the rate of formation of B is 7 mol L⁻¹ sec⁻¹, what is the rate of depletion of A?
Multiple Choice
The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N2O5(g) → 4 NO2(g) + O2(g). If the rate of appearance of O2 is 2.40 mol/min at a particular moment, what is the rate of disappearance of N2O5 at that moment?
Multiple Choice
The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below.2 K2Cr2O7 + 8 H2SO4 + 3 C2H6O → 2 Cr2(SO4)3 + 2 K2SO4 + 11 H2OIf the rate of appearance of Cr2(SO4)3 is 2.10 mol/min, what is the rate of disappearance of C2H6O?
Multiple Choice
In the Breathalyzer reaction, if the rate of appearance of Cr2(SO4)3 is 2.04 mol/min, what is the rate of disappearance of C2H6O?