Why does the added heat have to be reversible in the formula for calculating entropy change?

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luluna81mxmbk · Accepted Answer

Although the change in entropy of the system, be it an infinitesimal or finite change, is the same for all paths because entropy is a state function, in order to calculate what the change is you need to do it for a reversible path. Which means if the process is irreversible you need to assume any convenient reversible path and use  d      S          s      y      s        =            δ              Q                  r          e          v                      T  to calculate the finite change between two equilibrium states  Δ      S          s      y      s        =      ∫    1    2              δ              Q                  r          e          v                      T  Hope this helps.

Why does the added heat have to be reversible in the formula for calculating entropy change?

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