Question

The time of completion of 90% of a first order reaction is approximately ____________.

पर्याय

• 1.1 times that of half life

• 2.2 times that of half life

• 3.3 times that of half life

• 4.4 times that of half life

Answer 1

The time of completion of 90% of a first order reaction is approximately 3.3 times that of half life.

Explanation:

For a first order reaction,

k = `2.303/"t" log  "a"/(("a" - "x"))`

t = `2.303/"k" log  100/((100 - 90))`

= `(2.303 xx "t"_(1//2))/0.693 xx log  100/10`

= `3.3 xx "t"_(1//2) xx log 10`

= `3.3  "t"_(1//2)`