We’re being asked to calculate the lattice energy of calcium chloride (CaCl2).
Recall that lattice energy is the energy required to combine two gaseous ions into a solid ionic compound:
Mx+(g) + Ny–(g) → MyNx(s)
To calculate for lattice energy, we need to do the Born-Haber cycle for CaCl2.
We start with the corresponding formation equation for CaCl2:
Ca(s) + Cl2(g) → CaCl2(s), ΔH˚f
Calculate the lattice energy of calcium chloride given that the heat of sublimation of Ca is 121 kJ/mol and ΔH°f(CaCl2) = -795kJ/mol.
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