i figured out that
how do you find internal enegy of U=Q+W?
It is the CHANGE of Internal Energy that is a process quantity,
related to other process quantities like Work and Heat.
If this is a "thermally isolated system" or the steps happen "quickly",
then you treat Q = 0 . If it happens "slowly" or at known Temperature,
then you know T and should calculate I.E. from T (depending on the kind of gas)
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