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Confused on which are correct? Torn between 1,3,4.

Can I also get an explanation for why it's correct?


[1 mark] To calculate the expansion work for a process,
1) the formula w = -Pex (V2 - Vi) always works under all conditions.
2) the formula dw = -Pex dl can only be used for irreversible processes.
3) the formula dw = -Pex dl always works under all conditions.
4) the formula w=-nRT In (V2/Vi) always works for any isothermal reversible process.
5) None of the above is applicable.

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