Standard Enthalpies of Formation of Organic Compounds | Chemistry Net

Standard Enthalpies of Formation of Organic Compounds

Standard Enthalpies of Formation of selected organic compounds

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



  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

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