chemistry please help

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Calculate the lattice energy of potassium oxide from the following data:

Enthalpy of sublimation of potassium: +89.24 kJ/mol
Bond energy of oxygen: +498 kJ/mol
First ionization energy of potassium: +419 kJ/mol
1st electron affinity of oxygen: -141 kJ/mol
2nd electron affinity of oxygen: +744 kJ/mol
ÄHf potassium oxide: −363.17 kJ/mol


the answer is - 2232 kJ/mol. i do not know how to go about getting this answer. i know youre supposed to add everything and have it equal -363.17 but i don't know if there is something that i should exclude or something that i'm supposed to multiply by two. i just really need help please

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