Question

In the first order reaction, the concentration of reactant decreases from 1m to .25m in 20 minutes. The value of specifi rate is a)69.32



b.6.932



c.0.6932



d.0.06932 book

Answer 1

In a first order reaction,the concentration of the reactant decreases from 0.02M to 0.005M in 10min.The time taken to change the concentration of reactant from 0.16M to 0.025M
(a)10min(c)40min(b)20min(d)30min

A)
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Let t2 be the time for reactant to change concentration from 0.16 to .025.
t210=1/kln64/[A0]1/kln4[Ao]=3
t2=30min
Hence (d) is the correct answer