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Since entropy is a state function, it doesn't matter what path was used to get to the final condition. Therefore, to find entropy for irreversible system, you can use the same formula that is used for reversible system since it doesn't matter how the final entropy was reached.
To find the change in entropy of an irreversible expansion at a constant temperature, you could use the equation deltaS=nRln(V2/V1). This change in entropy equation can be used for both reversible and irreversible expansions, because entropy is a state function and is independent of the path taken to get from its initial to final value.
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