Question

Half life period of first order reaction is 60 minute. what percentage will be left after 240 minute?

Answer 1

240 minutes implies 4 half lifes

let initial percentage be 100%

after 60 minutes it will become 50%

after 120 minutes it will become 25%

after 180 minutes it will become 12.5%

and finally after 240 minutes

=>>>>6.25%

half life means the percentage of that reaction will become half in that time ...



thanks


UDIT:)