1.

The rate constant for a first order reaction is 6.93 xx 10^(-2) mi n^(-1). How long will it take a1M solution to be reduced to 0.5 M?

Answer»

600 MIN
6 hr
600 sec
10 sec

Solution :For 1 order, `t= 2.303/k log.(a)/(a-x)`
`= 2.303/(6.93 xx 10^(-2)mi N^(-1))xx log.(1)/0.5`
`= (2.303 xx 0.6990)/(6.93 xx 10^(-2)min`
= 10 min = 600 sec.


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