Using the following data, calculate the lattice energy of calcium chloride: Ca2+(g) + 2Cl– (g) → CaCl2(s) ΔHlattice = ? Sublimation enthalpy of calcium ΔH = 177.8 kJ/mol First ionization energy of calcium ΔH = 590.2 kJ/mol Second ionization energy of calcium ΔH = 1144.2 kJ/mol First electron affinity of chlorine ΔH = –349 kJ/mol Heat of formation of CaCl2(s) ΔH = –795.4 kJ/mol Bond energy of Cl2 (see Table 2) Use Hess’s law to calculate the lattice energy of calcium chloride. set-up must show all the chemical equations and you must show how their H values add up to give your answer.

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Using the following data, calculate the lattice energy of calcium chloride:

Ca2+(g) + 2Cl– (g) → CaCl2(s)      ΔHlattice = ?

Sublimation enthalpy of calcium  ΔH = 177.8 kJ/mol

First ionization energy of calcium   ΔH = 590.2 kJ/mol

Second ionization energy of calcium  ΔH = 1144.2 kJ/mol 

First electron affinity of chlorine   ΔH = –349 kJ/mol 

Heat of formation of CaCl2(s)    ΔH = –795.4 kJ/mol 

Bond energy of Cl2 (see Table 2)

Use Hess’s law to calculate the lattice energy of calcium chloride. set-up must show all the chemical equations and you must show how their H values add up to give your answer.

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