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Question

A first order reaction is $$20\%$$complete in 10 min. The specific rate constant of the reaction is_________ ($$in\:\: min^{-1}$$).


Solution

$$\displaystyle k\, =\, \frac{2.303}{t} log \frac{a}{a\, -\, x}$$
For $$20\%$$ completion,

$$\displaystyle k\, =\, \frac{2.303}{10} log \frac{100}{80}\, =\, 0.0223\, min^{-1}$$

Chemistry

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