For the reaction R - P, the concentration of R changes from 0.03 M to…

Question

For the reaction R -> P, the concentration of R changes from 0.03 M to 0.02 M in 25 minutes. What is the average rate of reaction in M min^-1?

Accepted Answer

B. 4.0 x 10^-4

1. Average rate $= -\dfrac{\Delta[R]}{\Delta t}$.
2. $\Delta[R] = 0.02 - 0.03 = -0.01\ 	ext{M}$ over $\Delta t = 25\ 	ext{min}$.
3. $r_{av} = -\dfrac{-0.01}{25} = 4.0	imes10^{-4}\ 	ext{M min}^{-1}$.
4. Distractor A (8.0 x 10^-4) wrongly omits dividing by time span fully or doubles the result.
_Source: syllabus Chemistry Ch 3 "Chemical Kinetics", p.5_

Answer

8.0 x 10^-4

Answer

2.0 x 10^-4

Answer

6.0 x 10^-4

For the reaction R -> P, the concentration of R changes from 0.03 M to 0.02 M in 25 minutes. What is the average rate of reaction in M min^-1?

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