Answer to Question #24463 in Physical Chemistry for arundhati roy
If you have 160 sec and time of half life, you can calculate number of concentration decreasing to one-half of its previous value.
160 sec / 32 sec = 5 and it means that you need divide original concentration on 2 five times to get 0.062 M, so
[C]/2^5 = 0.062 M
[C]/32 = 0.062 M
[C] = 0.062 M*32
[C] = 1.984 M = 2.0 M
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