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The rate constant of a first-order reaction is 4 x 10⁻³ s⁻¹. When the reactant concentration is 0.02 M, what is the rate of the reaction?
- 8 x 10⁻⁵ M s⁻¹
- 4 x 10⁻³ M s⁻¹
- 2 x 10⁻¹ M s⁻¹
- 4 x 10⁻¹ M s⁻¹
Correct answer: 8 x 10⁻⁵ M s⁻¹
Solution
Rate = k[A] = (4 x 10⁻³)(0.02) = 8 x 10⁻⁵ M s⁻¹.
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