Standard Enthalpies of Formation of Organic Compounds

Standard Enthalpies of Formation of selected organic compounds
Home > Fundamental Physical Constants - Chemical - Physical - Thermochemical Data > Standard Enthalpies of Formation of Inorganic Compounds > Standard Enthalpies of Formation of 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

 

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 ,

Comments

Post a Comment

Popular posts from this blog

Carbocations: Factors affecting their Stability

Image
A carbocation is a species where a carbon atom bonds to three carbon atoms and has a positive charge. Carbocations are electron deficient species and therefore very reactive and unstable . Anything which donates electron density to the electron-deficient center will help to stabilize them. Factors that stabilize them are the following:  Neighboring carbon atoms (inductive effect) Neighboring carbon-carbon multiple bonds (resonance effect) Neighboring atoms with lone pairs (resonance effect) How carbocations are stabilized by neighboring carbons atoms? The stability of carbocations decreases as the number of carbons attached to the C+ decreases. That means that tertiary carbocations are more stable than secondary that in turn are more stable than primary (Fig. 1). Fig. 1: Carbocation stability increases as methyl substitution increases around the electron deficient carbon C+. The methyl groups (-CH 3 ) are electron donating and therefore stabilize the positive charge (inductive effe
Read more

CHEMISTRY NET - INTRODUCTION - LIST OF TOPICS

Chemistry Net - Introduction - Table of Contents CHEMISTRY NET Analytical Chemistry Biological Chemistry Inorganic Chemistry Organic Chemistry Physical & Theoretical Chemistry Chemical News & Interesting / Chem. Data Chemistry is the understanding, the definition and the description of the structure and the behavior of matter, the matter that surrounds us and the matter we are consisting off. It is our history, our life and our future. It is sometimes called the central science because of its role in connecting the other physical sciences (physics, astronomy, earth sciences) with the life sciences (biology, medicine) and engineering. There are many approaches to studying this fascinating science but for convenience and historical reasons has been divided it into five fields: analytical , biological , inorganic , organic and physical chemistry. Chemistry is a challenging subject to teach and even more challenging to learn. This si
Read more