The half life period of a first order reaction is 50 min. In what time will it go to 90% completion ?

Explanation

To solve the problem of determining the time required for a first-order reaction to reach 90% completion, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Half-Life Formula for First-Order Reactions**:
The half-life (T_half) of a first-order reaction is given by the formula:
\[
T_{1/2} = \frac{\ln 2}{k}
...