For a chemicla reaction A`to`B, the change in concentration of A in 40s is `-0.04` mol/litre. What is the rate of chemical reaction?

Explanation

To find the rate of the chemical reaction A → B, we can follow these steps:

### Step 1: Understand the given information
We are given that the change in concentration of A over a time interval of 40 seconds is -0.04 mol/litre. This negative sign indicates that the concentration of A is decreasing as the reaction proceeds.

### Step 2: Write the formula for the average rate of reaction
The average rate of a chemical reaction can be calculated using the formula:
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