SEQ 4.2 The first electron affinity of oxygen is -141kJmol^-1 while the second electron affinity is +798 kJmol^-1 Explain.

The first electron affinity of oxygen refers to the energy change that occurs when one electron is added to a neutral oxygen atom to form an oxide ion (O^2-). The second electron affinity refers to the energy change that occurs when a second electron is added to the oxide ion to form a peroxide ion (O^2^2-).The first electron affinity of oxygen is negative because energy is released when an electron is added to a neutral oxygen atom. This is because oxygen has a high electronegativity and a strong tendency to gain electrons to achieve a stable electron configuration.The second electron affinity of oxygen is positive because energy is required to add a second electron to the oxide ion. This is because the oxide ion already has a negative charge, and adding a second electron increases the repulsion between the electrons. Therefore, energy is required to overcome this repulsion and add the second electron.In summary, the first electron affinity of oxygen is negative because energy is released when an electron is added to a neutral oxygen atom, while the second electron affinity is positive because energy is required to add a second electron to the oxide ion.