Calculate the workdone taking place when an ideal gas undergoes isothermal expansion.

Explanation

To calculate the work done when an ideal gas undergoes isothermal expansion, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Work Done in Expansion:**
The work done (W) during the expansion of a gas is defined as the integral of pressure (P) with respect to volume (V). For a small change in volume (dV), the work done is given by:
\[
dW = -P_{\text{external}} \, dV
...