Shown is a concentration versus time plot for a reaction involving gases A,B,and C.
-Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3.7 × 10^-5 M/s.What is the rate of reaction with respect to A over the time interval 700 to 800 seconds?

Question

Shown is a concentration versus time plot for a reaction involving gases A,B,and C.

-Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3.7 × 10^-5 M/s.What is the rate of reaction with respect to A over the time interval 700 to 800 seconds?

Quizplus · Accepted Answer

The slope of the concentration versus time graph represents the rate of reaction. Since the rate of reaction with respect to A is constant over the time interval 300 to 400 seconds, it can be assumed that the reaction is a first-order reaction with respect to A. Therefore, the rate of reaction with respect to A will be the same throughout the entire reaction, and thus the rate of reaction with respect to A over the time interval 700 to 800 seconds will be the same as the rate of reaction with respect to A over the time interval 300 to 400 seconds. Since the rate of reaction with respect to A over the time interval 300 to 400 seconds is 3.7 × 10^-5 M/s, the rate of reaction with respect to A over the time interval 700 to 800 seconds will be less than 3.7 × 10^-5 M/s (option B).

Shown Is a Concentration Versus Time Plot for a Reaction