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A system undergoes reversible expansion when the change is made with infinitesimal changes to pressure. In a irreversible expansion, the change cannot be undone, and the reaction proceeds with a constant external pressure.
A process is reversible if the system maintains thermodynamic equilibrium with its surroundings throughout the whole process. Reversible processes are less common than irreversible processes, and a perfectly reversible process is not possible.
In reality, all natural (real) processes are irreversible because biochemical systems often use highly irreversible rxns to speed up processes. Also, all spontaneous processes are irreversible. (like hot going to cold) Reversible reactions are the "ideal" and "perfect" system. (ex in class: perfect heat engine) and all heat can be converted to work. To answer your question then, the question should explicitly say that the reaction is reversible. This normally is worded with isothermal, meaning constant T, because T is constant along the pathway for reversible reactions.
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