How many moles of 1.00 M HC₂H₃O₂ and its conjugate base (C₂H₃O₂⁻) are needed to create 0.45 L of an HC₂H₃O₂ buffer solution with a pH of 4.50? (The Ka of HC₂H₃O₂ is 1.7 ✕ 10⁻⁵.)