Gibbs Energy of Formation for Ideal Gas at 298.15K and 1bar

• Definition

  Gibbs Energy of Formation for Ideal Gas at 298.15K and 1bar is defined as Gibbs Energy either absorbed or released when producing 1mol of compound in the ideal gas phase from single element substances of each element at 298.15K (absolute temperature) and 1 bar.

• Estimation Method

  - MolInstincts: The Property value is estimated by the thermodynamic relationship with other properties. The estimated value is finally determined after manual inspection.
  - Joback: Group Contribution Method (Estimation of pure-component properties from group-contributions, Chem.Eng.Commun., 1987. 57. 233)
  - Gani: Group Contribution Method (New Group Contribution Method for Estimating Properties of Pure Compounds, AIChE J., 1994. 5. 1697)

• Supplementary Explanation on Accuracy

  Comment	Meaning of Comment
  ≤ 1 kcal/mol	0 kcal/mol ≤ abs error ≤ 1 kcal/mol
  ≤ 3 kcal/mol	1 kcal/mol < abs error ≤ 3 kcal/mol
  ≤ 5 kcal/mol	3 kcal/mol < abs error ≤ 5 kcal/mol
  ≤ 7 kcal/mol	5 kcal/mol < abs error ≤ 7 kcal/mol
  > 7 kcal/mol	abs error > 7 kcal/mol
  Exp. Data Unavailable	Experimental Data are Unavailable

  Where absolute error means the absolute value of (experimental value)-(calculated value).