ΔH° and ΔS° for the reaction at 298 K is 24.8 J/mol.K and 180.58 kJ/mol.
A reaction that occurs in the internal combustion engine is
N₂(g) + O₂(g) ⇄ 2NO(g)
The standard molar entropy and enthalpy of formations can be calculated using the values of ΔS°and ΔH° as shown below.
NO, N2, and O2 have entropies of 210.65 J/mol. K, 191.5 J/mol. K, and 130.6 J/mol. K, respectively.
Fill in these values in the formula for standard entropy below.
ΔS° = 2S° NO(g) -(S° N2 (g) +S° O2(g))
ΔS°= 2 (210.65 J/mol K) - (191.5 J/mol K + 205.0 J/mol K)
= 24.8 J/mol K
Consequently, the typical entropy of reaction is 24.8 J/mol.K
NO, N2, and O2 have enthalpies of 90.29 kJ/mol, 0 kJ/mol, and 0 kJ/mol, respectively.
Replace these values in the common enthalpy formula below.
ΔH° = 2ΔH° f(NO(g)) –[ ΔH° f (N2) (g) + ΔH° f (O2)(g)]
ΔH° = 2 (90.29 kJ/mol) - ((0 kJ/mol) + ((0 kJ/mol))
= 180.58 kJ/mol
Consequently, the usual enthalpy of reaction is 180.58 kJ/mol
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