Problem: Thermodynamic Quantities for Selected Substances at 298.15 KSubstanceΔH˚f (kJ/mol)NO(g)90.37NO2(g)33.84N2O(g)81.6N2O4(g)9.66SO2(g)-296.9SO3(g)-395.2NaBr(s)-361.4NaBr(aq)-360.6Pb(NO3)2(s)-451.9Pb(NO3)2(aq)-421.3For NaBr(s) find the value of ΔH˚f.

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Balanced Reaction: 2Na(s) + Br2(g) → 2 NaBr(s)

Hrxn=Hf,products-Hf,reactants

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Problem Details

Thermodynamic Quantities for Selected Substances at 298.15 K

SubstanceΔH˚f (kJ/mol)
NO(g)90.37
NO2(g)33.84
N2O(g)81.6
N2O4(g)9.66
SO2(g)-296.9
SO3(g)-395.2
NaBr(s)-361.4
NaBr(aq)-360.6
Pb(NO3)2(s)-451.9
Pb(NO3)2(aq)-421.3


For NaBr(s) find the value of ΔH˚f.

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