# Problem: The half-life for a first order reaction is 50 sec when [A] o = 0.84 mol L−1. The time needed for the concentration of A to decrease to one-fourth of its original concentration is: a) 100 sec b) 150 sec c) 75 sec d) 200 sec e) 50 sec

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The half-life for a first order reaction is 50 sec when [A] o = 0.84 mol L−1. The time needed for the concentration of A to decrease to one-fourth of its original concentration is:

a) 100 sec

b) 150 sec

c) 75 sec

d) 200 sec

e) 50 sec

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Based on our data, we think this problem is relevant for Professor Raghavachari & Jarrold's class at IU.