A first order reaction is 60% complete in 20 minutes. How long will the reaction

Question

A first order reaction is 60% complete in 20 minutes. How long will the reaction take to be 84% complete?

Options:

A . 76 mins

B . 54 mins

C . 68 mins

D . 40 mins

Answer: Option D
:
D
If a reaction is 60% complete, 40% remains and if it is 84% complete, 16% remains.
For a first order reaction:

k = \frac{2.303}{20} l o g \frac{100}{40} = \frac{2.303}{t} l o g \frac{100}{16}

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