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Reaction between ethyl acetate and water...

Reaction between ethyl acetate and water attains a state of equilibrium in an open vessel but not the decomposition of `CaCO_(3).` Explain.

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In the first case, the reactants as well as the products are liquids and they will not escape from the vessel even if it is open. Therefore both the forward and backwards reaction will take place simultaneously and equilibrium will be reached. But in the decompositing of `CaCO_(3)` one of hte products is `CO_(2)`. Being a gas it will escape from the open vessel and the backward reaction will not take place. Therefore in the decompositing of `CaCO_(3)` equilibrium cannot be achieved.
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