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A system atchemical equilibriumcan do no work. The correct option isD.What is chemical equilibrium?Chemical equilibriumis a condition in a closed system where the rates of the forward and backward reactions are equal.The addition of HCl will raise theconcentrationof hydrogen ions in the forward reaction for the given reaction in chemical equilibrium; as a result, equilibrium will move to the left to undo the change.Anendothermicreactionis one that takes heat from the surroundings. Because an endothermic reaction requires heat to proceed, to raise the reaction's temperature.It will encourage the production of additional products and cause the equilibrium of the reaction to shift [ahead] to the right, or the product side.Therefore, the correct option isD)can do no work.To learn more aboutchemical equilibrium,refer to the below link:brainly.com/question/6705807#SPJ2...