The average rate of disappearance of I between 1200 s and 1600 s is _ M/s.

Question

Quizplus · Accepted Answer

To find the average rate of disappearance of I between 1200 s and 1600 s, we need to find the change in concentration of I over that time period and divide by the time interval. From the graph, we can see that the concentration of I goes from 0.080 M to 0.020 M over 400 s, so the change in concentration is 0.080 M - 0.020 M = 0.060 M. Then, we divide by the time interval of 400 s to get the average rate: 
0.060 M / 400 s = 0.00015 M/s = 1.5 × 10^-4 M/s. 
The closest answer choice is D) 2.0 × 10^-4 M/s, which is a bit larger than our calculated value, but there is no other answer choice that is closer, so D is the best choice.

The Average Rate of Disappearance of I Between 1200 S