A gas expands by `0.5L` against a constant pressure of `1 atm`. Calculate the work done in joule and calorie.

Explanation

To calculate the work done by the gas during expansion, we can follow these steps:

### Step 1: Identify the given values
- The change in volume (ΔV) is given as 0.5 L.
- The constant pressure (P) is given as 1 atm.

### Step 2: Use the formula for work done
The work done (W) during expansion against a constant pressure is given by the formula:
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