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1 answer:
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First, we need to convert the pressure in SI units. Keeping in mind that 
:
The initial and final volume of the gas are (keeping in mind that
):
So, the work done on the gas by the surrounding is
And the final positive sign means that this work corresponds to an increase in internal energy of the gas.
The initial and final volume of the gas are (keeping in mind that
So, the work done on the gas by the surrounding is
And the final positive sign means that this work corresponds to an increase in internal energy of the gas.