Table 1.1 shows some energy changes. (i) Born-Haber cycles can be used to determine the lattice energies of ionic compounds. Complete the Born-Haber cycle in Fig. 1.1 for potassium sulfide, $$\(\mathrm{K}_{2} \mathrm{~S}(\mathrm{~s})\)$$. Include state symbols for all of the species. ......................................... (ii) Calculate the lattice energy, $$\(\Delta H_{\text {latt }}^{\theta}\)$$, of $$\(\mathrm{K}_{2} \mathrm{~S}(\mathrm{~s})\)$$ using relevant data from Table 1.1. Show your working. $$\[ \Delta H_{\text {latt }}^{\ominus} \text { of } \mathrm{K}_{2} \mathrm{~S}(\mathrm{~s})= \]$$ .......................... $$\(\mathrm{kJ} \mathrm{mol}^{-1}\)$$

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