Chapter 14, Problem 4E

Suppose that for the reaction K+L → M, you monitor the production of M over time, and then plot the following graph from your data:

1. Is the reaction occurring at a constant rate from t=0 to t=15 min?
2. Is the reaction completed at t= 15 min? (c) Suppose the reaction as plotted here were started with 0.20 mol K and 0.40 mol L. After 30 min, an additional 0.20 mol K are added to the reaction mixture. Which of the following correctly describes how the plot would look from t= 30 min to t=60 min? (i) [M] would remain at the same constant value it has at t=30 min, (II) [M] would increase with the same slope as t=0 to 15 min, until t=45 min at which point the plot becomes horizontal again, or (iii) [M] decreases and reaches 0 at t= 45 min. [Section 14.2]