Question
A reactant concentration falls from 2 to 1 mol L⁻¹ in 25 s. What is its average rate of disappearance?
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Correct Answer: D. 0.04 mol L⁻¹ s⁻¹
Explanation:
Average disappearance rate = decrease in concentration divided by time.
The positive magnitude is used for a reactant-disappearance rate.
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