Problem: Calculate the ?H2nd electron affinity for Ca usingthe following data for the formation of CaO: Given: ? H sublimation: +192 KJ ? H ionization: the first and second ionization energies are:590.0KJ/mole and 1145. KJ/mole, respectively ? H dissociation: +494 KJ (Bond energy) ? H 1st electron affinity: -141 KJ/mole ? H formation: -636 KJ ? H lattice energy: -3514 The answer is said to be 845 kJ. I'm completely lost inthe steps. Please help! Thanks!

Question

Enthalpy of sublimation of Ca	178.2 kJ/mol
Cl-Cl bond energy	121.3 kJ/mol
1st ionization energy of Ca	590 kJ/mol
2nd ionization energy of Ca	1145 kJ/mol
Electron affinity of Cl	-349 kJ/mol
Enthalpy of formation of CaCl₂	-795.8 kJ/mol

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