Standard state enthalpy of formation at 298.15K and 1bar

• Definition

  Standard state enthalpy of formation (at 298.15K and 1bar) is the calorie that is either absorbed or released when making 1 mole of compound from single element substances of each element consisting the molecule at the standard temperature and pressure (298.15K and 1bar).

• Estimation Method

  - MolInstincts: The Property value is estimated by the combination of fundamental thermodynamic theories, modern modeling approaches, QSPR (quantitative structure-property relationships) methods, and ANN (Artificial Neural Network) with over fitting prevention algorithm, utilizing the quantum chemical calculations results and molecular descriptors. The estimated value is finally determined after manual inspection.

• 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).