A gas present in a cylinder fitted with a frictionless pistion expands against a constant pressure of `1atm` form a volume of `2L` to a volume of `6L`. In doing so, it absorbs `800J` heat form the surroundings. Determine the increases in internal enegry of process.

Explanation

To determine the increase in internal energy of the gas during the expansion process, we will apply the first law of thermodynamics, which states:

\[ \Delta U = Q + W \]

Where:
- \(\Delta U\) = change in internal energy
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