Question

In a first order reaction, the concentration of the reactant,
decreases from 0.8 M to 0.4 M in 15 minutes. The time taken
for the concentration to change from 0.1 M to 0.025 M is
(a) 7.5 minutes (b) 15 minutes
(c) 30 minutes (d) 60 minutes

Answer 1

Answer:

60 min options d is correct I think

Answer 2

Answer : 30 Minutes

The time taken  for the concentration to change from 0.1 M to 0.025 M is  30 Minutes

Explanation :

Hey Mate,

I will give you the simplest method of solving those types of questions in a few seconds. So, lets solve this.

Given : Concentration of the reactant, Decreases from 0.8M to 0.4M in 15 Minutes.

Means, The Concentration of reactant get half in 15 minutes. (From 0.8 to 0.4M)

So, t₁₎₂ = t (half) = 15 Minutes

Then,

In 15 minutes, Concentration of the reactant, Decreases from 0.1M to 0.05M and in another 15 minutes it's decreases from 0.05M to 0.025M.

So,

The total time taken  for the concentration to change from 0.1 M to 0.025 M is  30 Minutes.

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