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A First order reaction takes 40 min for ...

A First order reaction takes 40 min for `30%` decomposition. Calculate its rate constant

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Let initial concentration of the reactant = [R]_0
[R]_1= 0.70[R] _0
k= 2.303/tlog `[R]_0/[R]_0 = 2.303/40 log (10/7)min^-1`
=2.303/40 `xx0.1549 = 8.918 xx`10^-3 min^-1
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