Born-Fajans-Haber Cycle?

Suppose a chemist discovers a new metallic element and names it "Xtrinsium" (Xt).
Xt exhibits chemical behaviour similar to an alkaline earth.
Xt(s) + Cl2(g) XtCl2(s)

Lattice energy for XtCl2 -2280 kJ/mol
First Ionization energy of Xt 310 kJ/mol
Second Ionization energy of Xt 589 kJ/mol
Electron affinity of Cl -348.7 kJ/mol
Bond energy of Cl2 239 kJ/mol
Enthalpy of sublimation (atomization) of Xt 180 kJ/mol

Use the above data to estimate H?f for Xtrinsium chloride
PLEASE SHOW STEPS AND FINAL ANSWER...I WANT TO COMPARE IT WITH MY ANSWER. THANK YOU!
 
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