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Standard enthalpy change of formation (data table) These tables include heat of formation data gathered from a variety of sources, including the primary and secondary literature, as well as the NIST Chemistry WebBook.
31 Ιουλ 2024 · Calculate the change in enthalpy for a reaction using the heat of formation values of the reactants and products. The enthalpy of an element in its standard state is zero. However, allotropes of an element not in the standard state typically do have enthalpy values.
12 Οκτ 2020 · If a chemical change is carried out at constant pressure and the only work done is caused by expansion or contraction, q for the change is called the enthalpy change with the symbol ΔH, or \(ΔH^\circ_{298}\) for reactions occurring under standard state conditions.
This table lists the standard enthalpies (ΔH°), the free energies (ΔG°) of formation of compounds from elements in their standard states, and the thermodynamic (third-law) entropies (S°) of compounds at 298 K.
In chemistry and thermodynamics, the standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states.
34 Formula State of Matter Enthalpy (kJ/mol) Entropy (J mol/K) Gibbs Free Energy (kJ/mol) Ba 2TiO 4 (s) -2243.0424 196.648 -2133.0032 BaBr 2 (s) -757.304 146.44 -736.8024 BaBr 2 (g) -439.32 330.536 -472.792 BaBr 2•2H 2O (s) -1366.076 225.936 -1230.5144 BaCl 2 (s) -858.1384 123.67904 -810.4408 BaCl 2 (l) -832.44864 143.5112 -790.1484 BaCl 2 (g) -498.7328 325.64072 -510.69904
4 Νοε 2019 · The molar heat of formation or standard enthalpy of formation is the change in enthalpy when 1 mole of a substance is formed from its elements under standard state conditions. The standard enthalpy change of formation is the sum of the heats of formation of the products of a reaction minus the sum of the heats of formation of the reactants.
