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Half-life perood for a first order react...

Half-life perood for a first order reaction is 10 min. How much time is needed to change the concentration of the reactant from 0.08 M to 0.01 M ?

A

20 min

B

30 min

C

40 min

D

50 min

Text Solution

Verified by Experts

The correct Answer is:
B
` k = (0.693 ) /( t _ ( 1//2 ) ) = ( 0.693)/(10 ` per min
` rArr ( 0.693 ) /( 10 ) = ( 2.303 ) / ( t ) = log "" (0.08) /(0.01) `
` therefore t = 30 min `
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