Question

For a I^st order reaction nA¾® B whose concentration V_s time curve as shown below

If half life for the reaction is 24 mins the value of n is

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (C)

3

Answer 2

when t =48 min, a₀ –nx = x

or a₀ = (n +1) x

At t = 48 min, nx = $\frac{3a_{0}}{4}$

or a₀ = nx + x = $\frac{3a_{0}}{4}$ + x

or x = $\frac{a_{0}}{4}$

\ a₀ = (n + 1) × $\frac{a_{0}}{4}$

or n + 1 = 4

or n = 3