A simple of gas present in a cylinder fitted with a frictionless piston expands against constant pressure of `1atm` from a volume fo `2L` to `12L`. During the process, it absorbs `600J` of heat from the surroundings. Calculate the change in internal energy of the system.

Explanation

To solve the problem, we will use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat added to the system (Q) plus the work done on the system (W). The equation can be written as:

\[ \Delta U = Q + W \]

### Step-by-Step Solution:

1. **Identify the Given Values:**
- Initial volume (V1) = 2 L
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