At 25 deg. c, the second-order reaction nocl(g)no(g)+
1/2 cl2(g) is 50% complete after 5.82 hours when the
initialconcentration of nocl is 4.46 mol/l. how long will it
takefor the reaction to be 75% complete?

It will take 17.46 hours for the reaction to be 75% complete.

Explanation:

Half life for second order kinetics is given by:

= half life = 5.82 hour

k = rate constant =?

= initial concentration = 4.46 mol/L

Integrated rate law for second order kinetics is given by:

[a] = concentration left after time t =

It will take 17.46 hours for the reaction to be 75% complete.

it's c (engineer's do their work with mechanical stuff not on any living being)