Molarity of Sodium Ions in a NaCl Solution

Consider a solution prepared by dissolving 3 moles of sodium chloride (NaCl) in 2 liters of water. Sodium chloride is known to dissociate completely in water into its constituent ions, sodium (Na⁺) and chloride (Cl^-). If the final volume of the solution remains approximately 2 liters, what is the molarity of the Na⁺ ions in this solution?