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A decomposing substance has 0.01 % of it consumed in 1 millisecond when the concentration is 0.02 M, and the same 0.01 % consumed in 0.25 millisecond when the concentration is 0.04 M. What is the order of the reaction?
- 1
- 2
- 3
- 0
Correct answer: 3
Solution
Since t proportional to C^(1-n), the ratio (1 ms)/(0.25 ms) = 4 = (0.02/0.04)^(1-n) = (0.5)^(1-n) gives 1-n = -2, so n = 3.
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