Chemical Kinetics and Nuclear ChemistryHard

Question

T50 (Half-life period) of first-order reaction is 10 minute. Starting with 10 mol L-1, rate after 20 minute is :

Options

A.0.0693 mol L-1 min-1
B.0.0693 × 2.5 mol L-1 min-1
C.0.0693 × 5 mol L-1 min-1
D.0.0693 × 10 mol L-1 min-1

Solution

Conc. after at 2 half life (20 minute) = × (Initial conc.)
= × 10 = 2.5 M.
Then Rate = k[at] = × 2.5 = .06932 × 2.5

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