For a first-order reaction; A → B, the reaction rate at a reactant concentration of 0.01 M is found to be `3.0×10^(−5) mol L^(−1) s^(−1)` . The half-life period of the reaction is:

Explanation

To find the half-life period of the first-order reaction A → B, we can follow these steps:

### Step 1: Understand the relationship between rate and concentration
For a first-order reaction, the rate of reaction (rate) can be expressed as:
\[ \text{Rate} = k \cdot [A] \]
where \( k \) is the rate constant and \([A]\) is the concentration of the reactant A.

### Step 2: Substitute the given values
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