In a first order reaction, 10% of the reactant is consumed in 25 minutes. Calculate :
The half-life of the reaction.

Explanation

To solve the problem of calculating the half-life of a first-order reaction in which 10% of the reactant is consumed in 25 minutes, we can follow these steps:

### Step 1: Understand the initial conditions
Let's denote the initial concentration of the reactant A as \( A_0 \). If 10% of A is consumed, then 90% remains. Therefore, at time \( t = 25 \) minutes, the concentration of A is:
\[ A_t = A_0 - 0.1 A_0 = 0.9 A_0 \]

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