Consider the following information. • The enthalpy of formation of BaO is AH; = -548.0 kJ/mol. • The enthalpy of sublimation of Ba is AHgub = 180.0 kJ/mol. • The first and second ionization energies of Ba are IE¡ = 503 kJ/mol and IE, = 965 kJ/mol. • The first electron affinity of O is AHEA1 = -142 kJ/mol. • The bond energy of O, is BE = 498 kJ/mol. • The lattice energy of BaO is AHjattice = -3029 kJ/mol. Determine the second electron affinity of O. AHEA2 = kJ/mol
Electron Affinity
When an element undergoes a chemical reaction, it either gains energy or loses energy. This gain or loss of energy is due to the phenomena that occur at atomic level. During reaction, atoms either gain electrons from other atoms or lose electrons to other atoms, and in that process, energy is produced.
P-Block Elements
Elements which are present on the right side of the periodic table are called p-block elements. In addition to the noble gases, they include the families of boron, mercury, nitrogen, oxygen and fluorine. These elements have diverse real-life implementations that we regularly experience around us.
Metals and Non-metals
The periodic table is composed of metals, semi-metals and nonmetal elements. The physical and chemical properties of metals and nonmetals differ from each other. The study of metals and nonmetals will help one to understand the appropriate application of the particular element.
![### Consider the following information:
- The enthalpy of formation of BaO is \( \Delta H_f^\circ = -548.0 \, \text{kJ/mol} \).
- The enthalpy of sublimation of Ba is \( \Delta H_{\text{sub}} = 180.0 \, \text{kJ/mol} \).
- The first and second ionization energies of Ba are \( \text{IE}_1 = 503 \, \text{kJ/mol} \) and \( \text{IE}_2 = 965 \, \text{kJ/mol} \).
- The first electron affinity of O is \( \Delta H_{\text{EA1}} = -142 \, \text{kJ/mol} \).
- The bond energy of \( \text{O}_2 \) is \( \text{BE} = 498 \, \text{kJ/mol} \).
- The lattice energy of BaO is \( \Delta H_{\text{lattice}} = -3029 \, \text{kJ/mol} \).
Determine the second electron affinity of O.
\[
\Delta H_{\text{EA2}} = \underline{\hspace{3cm}} \, \text{kJ/mol}
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