A first-order reaction is 50% completed

Question:

A first-order reaction is 50% completed in 1.26 × 1014 s. How much time

would it take for 100% completion?

(i) 1.26 × 1015 s

(ii) 2.52 × 1014 s

(iii) 2.52 × 1028 s

(iv) infinite

Solution:

Option (iv) infinite is the answer.

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