Question

In a first order decomposition reaction, 50% of a compound decomposes in 10.5 min. how long will it takes for 75% of the compound to deomposses?

Answer 1

15.75 minutes because 75 - 50= 25%

If 50% takes 10.5 minutes to decompose, half of 50% is 25% meaning we half 10.5 minutes to get 5.25 minutes. We add this to the 10.5 minutes to get 15.75 minutes.