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What is [H3O+] in a solution obtained by dissolving 220 mL HCl(g), measured at 23∘C and...

What is [H3O+] in a solution obtained by dissolving 220 mL HCl(g), measured at 23∘C and 750 mmHg , in 4.20 L of aqueous solution?

Express your answer using three decimal places.

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