Rank the following ionic compounds by lattice energy. Rank from highest to lowest lattice energy. ▾ View Available Hint(s) ▸ Hint 1. Identify which factors affect lattice energy Hint 2. Identify the charges Hint 3. Rank the radii Na₂O BeO Na₂S LiCl MgO Reset Help
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![Given the following thermodynamic data, calculate the lattice energy of CaBr₂ (s).
Term
Value (kJ/mol)
AH [CaBr₂ (s)]
AH;[Ca(g)]
AHvap [Br2 (1)]
AHbond [Br₂ (g)]
I₁ (Ca)
I₂ (Ca)
E(Br)
ΔΗatt
·latt =
0
-675
179
Note that the overall formation of gaseous bromine atoms from liquid bromine molecules can be thought of as consisting of two steps, vaporization of the
liquid to the gas followed by dissociation of the gaseous molecules into the component gaseous atoms. The enthalpies involved are AHvap [Br2 (1)] and
AHbond [Br₂ (g)], respectively.
Express your answer to four significant figures and include the appropriate units.
► View Available Hint(s)
30.8
193
Value
590.
1145
-325
μA
Units
.....
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