Can Entropy Decrease in Endothermic Reactions?

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Entropy can both increase and decrease in endothermic reactions depending on the specific conditions of the closed system. While the entropy of the system itself may decrease, the total entropy of the system plus its surroundings must always increase or remain constant in reversible processes. This principle aligns with the second law of thermodynamics, which governs the behavior of entropy in chemical reactions.

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I forgot where I saw it but recently I saw somewhere that entropy decreases in endothermic reactions. On other sites however, they say that entropy can only increase and not decrease. Can someone tell me which is right?

Thanks
 
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Both are right. The entropy of a closed system can increase of decrease, depending on what is done to it between its initial equilibrium state and its final equilibrium state. But, for the system plus the surroundings as a whole, the combined entropy can only increase (or in a reversible process, stay constant).
 
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I see, thanks
 

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