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

Explanation

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

### Step-by-Step Solution:

1. **Identify Initial and Final Concentrations**:
- Let the initial concentration of the reactant be \( [A]_0 = 100 \) (arbitrary units).
- Since 10% of the reactant is consumed, the amount consumed \( x = 10 \).
- Therefore, the final concentration \( [A] = [A]_0 - x = 100 - 10 = 90 \).
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