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For the zero-order reaction A -> B, the concentration of A versus time graph is given (from which the rate constant k = 0.1 M/s can be read). Calculate the time required to reduce the concentration of A from 2 M to 0.5 M.
- 10 sec
- 20 sec
- 15 sec
- 25 sec
Correct answer: 15 sec
Solution
Zero-order reaction: [A]t = [A]0 - k*t. Time = ([A]0 - [A]t)/k = (2.0 - 0.5)/0.1 = 15 sec.
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