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Q.

A first order reaction is half – completed in 45 minutes. How long does it need for 99.9% of the reaction to be completed?

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a

20 hours

b

10 hours

c

712 hours

d

5 hours

answer is C.

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Detailed Solution

k = 0.69345 further t = 2.3030.693 × 45 log 100100 − 99.9

= 2.303 × 45. × 30.693 = 7 12 hours.

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A first order reaction is half – completed in 45 minutes. How long does it need for 99.9% of the reaction to be completed?