Eduprobe
Question:
The time for half-life period of a certain reaction A→products is 1 hour. When the initial concentration of the reactant A is 2.0 mol L⁻¹, how much time does it take for its concentration to come from 0.50 to 0.25 mol L⁻¹ if it is a zero-order reaction?
4 h
0.5 h
1 h
0.25 h
Solution:
For a zero order reaction
k = x/t → (1)
Where x = amount decomposed
For a zero order reaction,
k = [A]₀ / 2t₁₂
Since [A₀] = 2M, t₁₂ = 1hr; k = 1
From equation (1), t = 0.25/1 = 0.25hr