The concentration of a reactant falls from 0.80 to 0.20 mol dm⁻³ in 30 s. What is the average rate of reaction?
Correct answer A. 0.020 mol dm⁻³ s⁻¹
Explanation
Average rate equals the change in concentration divided by the time taken: (0.80 − 0.20) ÷ 30 = 0.020 mol dm⁻³ s⁻¹ over this interval.
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