In a first order reaction the concentration of reactant decreases from 800 mol/dm 3 50 mol/dm 3 in 200 sec . The rate constant of reaction in s − 1 is

Question

In a first order reaction the concentration of reactant decreases from 800 mol/dm 3 50 mol/dm 3 in 200 sec . The rate constant of reaction in s − 1 is, 2 × 10 &minus; 4 s − 1, 1.386 × 10 − 2 s − 1, 3.45 × 10 5 s − 1, 2 × 10 4 s − 1

MARKS App · Accepted Answer

C t = C 0 2 n 2 n = 800 50 =16 2 n = 2 4 So, n = 4 4T 1 2 = 200 sec T 1 2 = 50 sec K = 0 .693 T 1 2 = 0 .693 50 = 1 .386 × 10 − 2 sec − 1

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