Standard Enthalpies of Formation of Inorganic Compounds

 

The standard enthalpy of formation ΔΗ°_f of a substance is the change in enthalpy for the reaction that forms 1 mol of the substance from its elements with all reactants and products at 1 atm pressure and usually 298.15 K. For any element in its most stable state at 298 K and 1 atm pressure, ΔΗ°_f = 0.

A bond dissociation enthalpies table can be found in the post "Bond Dissociation Enthalpies".

 

Table 1: Standard Molar Enthalpies of Formation ΔΗ°f at 25 °C (298.15K)

Substance	Formula	ΔΗ°f
Calcium carbonate	CaCO3(s)	-1207.1
Calcium oxide	CaO(s)	-635.5
Carbon dioxide	CO2(g)	-393.5
Carbon monoxide	CO(g)	-110.5
Hydrogen bromide	HBr(g)	-36.23
Hydrogen chloride	HCl(g)	-92.30
Hydrogen fluoride	HF(g)	-268.6
Hydrogen iodide	HI(g)	25.9
Magnesium carbonate	MgCO3(s)	-1111.69
Nitrogen oxide	NO(g)	90.29
Nitrogen dioxide	NO2(g)	33.10
Nitric acid	HNO3(g)	-134.31
Sulfur dioxide	SO2(g)	-296.81
Sulfur trioxide	SO3(g)	-395.77
Sulfuric acid	H2SO4(l)	-811.30
Silver chloride	AgCl(s)	-127.0
Sodium bicarbonate	NaHCO3(s)	-947.7
Sodium carbonate	NaCO3(s)	-1130.9
Sodium chloride	NaCl(s)	-410.9
Water	H2O (l)	-285.8
Water vapor	H2O (g)	-241.8

 

---

Relevant Posts

Bond Dissociation Enthalpies

Standard Enthalpies of Formation of Organic Compounds

 

---

References

1. CRC Handbook of Chemistry and Physics, 52nd edition, The Chemical Rubber Co., (1971)
2. David W. Oxtoby, H.P. Gillis, Alan Campion, “Principles of Modern Chemistry”, Sixth Edition, Thomson Brooks/Cole, 2008
3. Steven S. Zumdahl, “Chemical Principles”  6th Edition, Houghton Mifflin Company, 2009

---

Key Terms

standard enthalpies of formation, molar enthalpies of formation, table of standard enthalpies of formation ,

---