Answer :
The internal energy of the gas is 500 J (joules). Converting this to calories, we can approximate it to be around 119.5 cal (calories).
Therefore, the work done on the system can be estimated to be approximately 119.5 calories.
It's important to note that the conversion from joules to calories is not exact since 1 calorie is equivalent to 4.184 joules. The approximation used here assumes a simplified conversion factor of 1 calorie = 4 joules for ease of calculation.
The actual conversion factor may vary depending on the context and the specific system being considered.
