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A solution is composed of 0.060 moles of HCl in 300.0 mL of water. What is the concentration of [Cl-] and [H3O+] in the solution?

A solution is composed of 0.060 moles of HCl in 300.0 mL of water. What is the concentration of [Cl^-] and [H₃O⁺] in the solution?