At high temperatures iodine molecules can dissociate into iodine atoms. For the reaction I₂(g) ⇌ 2 I･(g) Kc = 1.27 × 10⁻⁴ at 900 °C. A 80.5 g sample of I₂ is placed in a 1.00 L vessel and heated to 900 °C. What will be the molar concentration of iodine atoms, [I･], in the vessel when the system comes to equilibrium?

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