Question

For a second order reaction, the unit of the rate constant (k) is : A time-1 B mol L time-1 C Lmol-1 time-1 D L’ mol-2 time?

JEE/Engineering Exams

Chemistry

Solution

183

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If the reaction is second order, then two units of concentration are already present so the rate constant needs reciprocal time plus inverse units of concentration, L mol ( ^{-1} s^{-1} ). If the reaction is third order, the rate constant should have units of ( L^{2} mathrm{mol}^{-2} mathrm{s}^{-1} ).