During this process the temperature is kept constant. Since the internal energy of ideal gases only depends on temperature: \(\Delta U=0\) and \(\Delta H=0\).

The first principle tells us: \(\Delta U=q+w\;\;\rightarrow q=-w\) . In this process, the heat exchanged is equal to the work done. We calculate the work done by the gas using the equation of state.
It can be put as a function of the initial and final state pressures using Boyle's law,
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