Chemistry, 08.02.2021 17:30 Imanilh

It take 42 min for the concentration of a reactant in a first order reaction to drop from 0,45 mol/l to 0,32 mol/l at 25 °C. How long will it take for the reaction to be 90% complete ? A) 130 min
B) 86 min
C) 137 min
D) 284 min

i want the explanation please

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It take 42 min for the concentration of a reactant in a first order reaction to drop from 0,45 mol/l...