Standard Enthalpies of Formation of Organic 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. Standard enthalpies of formation of inorganic compounds were given in a previous post.

 

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

Substance	Formula	ΔΗ°f
Acetylene	C2H2(g)	226.7
Acetic Acid	CH3COOH(l)	-484.0
Acetaldehyde	CH3CHO(g)	-166.0
Benzene	C6H6(l)	49.0
Carbon Tetrachloride	CCl4(l)	-135.0
Diamond	C(s)	1.88
Ethane	C2H6(g)	-84.68
Ethanol	C2H5OH(l)	-277.7
Ethylene	C2H4(g)	52.30
Ethylene Oxide	C2H4O(g)	-53.00
Formaldehyde	HCOOH(g)	-116
Formic Acid	C2H4(g)	-363
Glucose	C6H12O6(s)	-1273
Methane	CH4(g)	-74.80
Methanol	CH3OH(g)	-201
Propane	C3H8(g)	-103.85
Propene	C3H6(g)	20.90
Sucrose	C12H22O11(s)	-2221

 

---

Relevant Posts

Standard Enthalpies of Formation of Inorganic 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 ,

---