# Construct a Born-Haber cycle for the formation of the hypothetical compound NaCl2, where the sodium ion has a 2+ charge (the 2nd ionization energy for sodium is given in Table 7.2 in the textbook).Part AHow large would the lattice energy need to be for the formation of NaCl2 to be exothermic? Part BIf we were to estimate the lattice energy of NaCl2 to be roughly equal to that of MgCl2 (2326 kJ/mol from Table 8.2 in the textbook), what value would you obtain for the standard enthalpy of formation, ΔH∘f, of NaCl2?

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#### Part A

How large would the lattice energy need to be for the formation of NaCl2 to be exothermic?

#### Part B

If we were to estimate the lattice energy of NaCl2 to be roughly equal to that of MgCl2 (2326 kJ/mol from Table 8.2 in the textbook), what value would you obtain for the standard enthalpy of formation, ΔH∘f, of NaCl2?
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Step 1

The Born-Haber cycle for the formation of hypothetical compound NaCl2 can be constructed as given below.

Step 2

The various reactions are given as,

Step 3

Using Hess&rsqu...

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