For a first order reaction, the time required for 99.9% completion is 100 min. What will be the rate constant for the reaction?1.25 x 10-4 5-11.15 x 10-35-12.2 x 10-25-14.5 x 10-2 s-1

For a first order reaction, the time required for 99.9% completion i

1.	For a first order reaction, the time required for 99.9% completion is 100 min. What will be the rate constant for the reaction?1.25 x 10-4 5-11.15 x 10-35-12.2 x 10-25-14.5 x 10-2 s-1
Answer» For FIRST ORDER REACTION,t=k2.303loga−xaGiven that:- x=99.9a for t99.9%x=0.5a for T50%∴t50%t99.9%=k2.303loga−0.5aak2.303loga−0.999aa⇒t50%t99.9%=log0.51log0.0011⇒t50%t99.9%