Question

A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of reaction is

Answer 1

Answer:

The reaction goes to 50% completion in first 2 hours. If the initial concentration is A, it becomes A/2 in 2 hours. 

Then, in the next 2 hours, it comes A/4from A/2. This means it again reduced by half in 2 hours. 

This means the half-life of the reaction is 2hours which is constant. Half-life is constant in the first order reaction. Hence, the order of the reaction is 1.