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Given the following thermodynamic data, calculate the lattice energy of CaBr2(s).
Term Value (kJ/mol)
ΔH∘f[CaBr2(s)] -675
ΔH∘f[Ca(g)] 178
ΔH∘f[Br(g)] 112
I1(Ca) 590.
I2(Ca) 1145
EA(Br) -325
Express your answer to four significant figures, and include the appropriate units.
♦ Relevant knowledge
The lattice represents the energy that is absorbed by the ionic substance in order to dissociate into its ions when in their gaseous states. There are numerous steps to extract the gaseous ions that are formed from the solid ionic compound. Therefore, that the energy in the structure of the compound could be determined using Hess’s law.
1 Answer