6.20 Salts containing the [N₁] and [3] ions are known (see Section 15.5), but (as of 2016) the ionic salt [N] [N3] has not been isolated. (a) Use the VBT approach to estimate the lattice energy of [N5] + [N3]. Data: V (N5¹) = 0.051 nm³; V(N3¯) 0.051 nm³; V(N3-) = 0.058 nm3³. (b) Given that AH°(298 K) for [N₁]+(g) and [N3] (g) = +1479 and +198 kJ mol-¹, respectively, use your answer from part (a) to estimate AHO (298 K) for [N₁][N3] (s). Comment on the value obtained for A Hº ([Ns] [N3]¯¯, s) and on any assumptions made. What can you say about the thermodynamic stability of [N5] [N3]¯(s)? 50001 Di
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.
![6.20 Salts containing the [N5] and [3] ions are known
(see Section 15.5), but (as of 2016) the ionic salt
[N] [N3] has not been isolated. (a) Use the VBT
approach to estimate the lattice energy of [N5]+[N3].
Data: V (N5¹) = 0.051 nm³; V(N3¯)
0.051 nm³; V(N₂) = 0.058 nm3³.
(b) Given that AH (298 K) for [N₁]+(g) and
[N3] (g) = +1479 and +198 kJ mol-¹, respectively,
use your answer from part (a) to estimate
AH (298 K) for [N5] [N3] (s). Comment on the value
obtained for AH° ([N₁][N3]¯¯, s) and on any
assumptions made. What can you say about the
thermodynamic stability of [N5]*[N3]¯(s)?
50001
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