A first-order reaction is 50 % completed in 1.26 x 1014 s.
The time required for 100 % completion
of the reaction will be:
1. 1.26 × 1015 s
2. 2.52 × 1014 s
3. 2.52 × 1028 s
4. Infinite
HINT:
Explanation:
The time taken for half the reaction to complete. ie., the time in which the concentration of a reactant is reduced to half of its original value is called half-life period of the reaction.
But it is impossible to perform 100% of the reaction. Whole of the substance never reacts because in every half-life, 50% of the substance reacts. Hence, time taken for 100% completion of a reaction is infinite.
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