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Laboratory experiments often employ various chemical decomposition and synthesis reactions as a means of determining spontaneity of a reaction.

Based on experience and knowledge of reactions, which of the following reactions, with no additional changes in the system, would benefit the most from the use of a catalyst?


Carboxylic acid decomposing to form carbon dioxide and water in an open system.


Copper metal mixing with carbon dioxide and water to form copper (II) carbonate, tarnished copper.


Hydrogen peroxide decomposing to form water and oxygen gas in an open system.


Nitrogen and hydrogen forming ammonia in an open system.

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