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5mol of an ideal gas at 293K is expanded...

`5mol` of an ideal gas at `293K` is expanded isothermally from an initial pressure `0.4 kPa` to a final pressure of `0.1kPa` against a constant external pressure of `0.1kPa`.
a. Calcualte `q,w, Delta,U`, and `DeltaH`.
b. Calculate the corresponding value of `q,w, DeltaU`, and `DeltaH` if the above pressure is carried out reversibly.

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