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It takes 42.0 minutes for the concentration of a reactant in afirst-order reaction to drop from 0.45 M to 0.32 M at 25 deg C. Howlong will it take for the reaction to be 90% complete?
A. 13.0 minutes
B. 86.0 minutes
C. 137 minutes
D. 222 minutes
E. 284 minutes

Sagot :

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