A reaction that is second order in one reactant has a rate, Ask an Expert

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A reaction that is second order in one reactant has a rate constant of 4.0 x 10^-2 L x Mol^-1 s^-1 . If the initial concentration of the reactant is 0.380 mol x L^-1, how long will it take for the concentration to become 0.190 mol x L^-1?

A. 66 s
B. 33 s
C. 660 s
D. 170 s
E. 17 s

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