please help me within five minutes?

timer Asked: Nov 2nd, 2014

Question description

Suppose a chemist discovers a new metallic element and names it "Xercisium" (Xr). 
Xr exhibits chemical behaviour similar to an alkaline earth.

Lattice energy for XrCl2-1940 kJ/mol
First Ionization energy of Xr 350 kJ/mol
Second Ionization energy of Xr 665 kJ/mol
Electron affinity of Cl-348.7 kJ/mol
Bond energy of Cl2 239 kJ/mol
Enthalpy of sublimation (atomization) of Xr  190 kJ/mol

Use the above data to estimate Δf for Xercisium chloride.

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