Reaction stoichiometry is ambiguous due to unclear description of ester formation Steps:

• Identify reactants: 1 mol ethanoic anhydride ((CH₃CO)₂O) and 1 mol ethanoic acid (CH₃COOH) react with water.
• Standard anhydride hydrolysis: (CH₃CO)₂O + H₂O → 2 CH₃COOH (1 mol water yields 2 mol acid total with the existing 1 mol).
• Question claims ester formation and "2 mol carboxylic acid only," but no alcohol is mentioned for esterification; anhydride + acid + water typically yields only acids, not ester.
• No balanced equation fits ester + exactly 2 mol acid with given reactants, making water moles indeterminate.

Why C is correct:

• Not applicable; ambiguity prevents confirming 2 mol water.

Why the others are wrong:

• A and B (1 mol): Matches standard hydrolysis but ignores ester claim and "2 mol acid only."
• D (2 mol): No chemical basis in described reaction for 2 mol water.

Not enough information. Final answer: Not enough information.