Using the thermochemical data below and an estimated value of −2481 kJ/mol for the lattice energy for Na₂O, calculate the value for the second electron affinity of oxygen [O⁻(g) + e⁻ n O²⁻(g)].

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Quantity Enthalpy of atomization of Na lonization energy of Na Enthalpy of formation of solid Na₂O Enthalpy of formation of O(g) from 0₂ First electron attachment enthalpy of O Numerical Value (kJ/mol) 107.3 495.9 -418.0 249.1 - 141.0