[{"data":1,"prerenderedAt":2347},["ShallowReactive",2],{"reference-standard-enthalpies-of-formation":3},{"table":4},{"id":5,"slug":6,"title":7,"shortTitle":8,"category":9,"description":10,"metaDescription":11,"columns":12,"dataSource":37,"entryCount":38,"notes":39,"relatedTopics":47,"relatedElements":49,"seoKeywords":61,"source":70,"rows":83},10,"standard-enthalpies-of-formation","Standard Thermodynamic Properties (ΔH°f, ΔG°f, S°)","Standard Enthalpies of Formation","thermodynamics","Standard enthalpy of formation (ΔH°f), standard Gibbs free energy of formation (ΔG°f), and absolute standard entropy (S°) for 360 substances at 298.15 K. Use these values with Hess's law (ΔH°rxn = Σ n·ΔH°f products − Σ n·ΔH°f reactants) and with ΔG°rxn = ΔH°rxn − T·ΔS°rxn for spontaneity. Pure elements in their standard reference state have ΔH°f = ΔG°f = 0 by definition.","Standard enthalpy of formation table (ΔH°f) and absolute entropy values for 360 substances at 25°C — free chemistry reference for Hess's law and thermodynamics calculations.",[13,17,21,24,27,31,34],{"key":14,"label":15,"type":16},"substance","Substance","text",{"key":18,"label":19,"type":20},"formula","Formula","chem",{"key":22,"label":23,"type":16},"phase","Phase",{"key":25,"label":26,"type":16},"form","Form",{"key":28,"label":29,"type":30},"deltaH_f_kJ_per_mol","ΔH°f (kJ/mol)","number",{"key":32,"label":33,"type":30},"deltaG_f_kJ_per_mol","ΔG°f (kJ/mol)",{"key":35,"label":36,"type":30},"S_J_per_mol_K","S° (J/mol·K)","oer-extracts/chemistry-2e/appendix-g.json",361,[40,41,42,43,44,45,46],"All values at 298.15 K (25 °C) and 1 bar; aqueous ions referenced to 1 mol/L with S°(H⁺, aq) ≡ 0.","Pure elements in their standard reference state (graphite for C; H₂, N₂, O₂ as gases; etc.) have ΔH°f = ΔG°f = 0 by definition.","Use Hess's law: ΔH°rxn = Σ n·ΔH°f(products) − Σ n·ΔH°f(reactants), where n is the stoichiometric coefficient.","For ΔG°rxn use ΔG°rxn = ΔH°rxn − T·ΔS°rxn (T in K, ΔS° in J/(mol·K) — convert to kJ before combining).","Some entries have a `form` qualifier (graphite vs diamond for C, red vs yellow for HgO, rhombic vs monoclinic for S) — pick the form your problem specifies.","Coordination complexes near the bottom of the table use bracket notation; ligands like en = ethylenediamine. Solid phase assumed.","Aqueous-ion entropies are NOT absolute — they're referenced to S°(H⁺, aq) ≡ 0. Negative S° values for ions are real (relative to that convention).",[48],"thermochemistry",[50,51,52,53,54,55,56,57,58,59,60],"H","C","N","O","Na","Cl","Fe","Cu","Al","Hg","S",[62,63,64,65,66,67,68,69],"standard enthalpy of formation","delta H formation","ΔH°f table","Hess's law","thermochemistry reference","standard entropy","Gibbs free energy of formation","thermodynamic properties",{"book":71,"section":72,"license":73,"url":74,"extracted_at":75,"extracted_via":76,"reference_state":77,"content_class":78,"known_duplicates":79,"supplemental_entries":80,"supplemental_entries_note":81,"row_identity":82},"OpenStax Chemistry 2e","Appendix G — Standard Thermodynamic Properties for Selected Substances","CC BY 4.0","https://openstax.org/books/chemistry-2e/pages/g-standard-thermodynamic-properties-for-selected-substances","2026-05-12","playwright","All values at 298.15 K (25 degC) and 1 bar (or 1 mol/L for aqueous ions). DeltaH_f and DeltaG_f are standard enthalpy/Gibbs energy of formation from elements in their standard reference states; S is absolute standard entropy. Pure elements in their standard reference state have DeltaH_f = DeltaG_f = 0 by definition. Em-dash in source rendered as null in numeric fields. Charge signs in formula/substance normalized from Unicode en-dash to ASCII hyphen. Spaced charges (NH4 +, CO3 2-) preserved per formatChemText conventions.","reference_table","5 identical-value duplicate rows (HF/HCl/HBr/HI/H2S, all gas-phase) appear in the source; treat as same row. 1 distinct-value duplicate (Hg2+(aq)) is an OpenStax subscript bug — first row is actually Hg2^2+(aq) (mercury(I) dimer cation, dropped subscript); second row is Hg^2+(aq) (mercury(II)). Per-row source_note + formula_canonical disambiguates.",1,"Some items have a source_note field flagging them as supplemental (not from OpenStax Appendix G). Currently: NaOH(s).","Every item has a 1-based row_index field giving deterministic position in the items array. The id of a substance is the tuple (formula_canonical, phase, form) — formula_canonical is the ASCII charge grammar (e.g. CO3^2- instead of CO3 2-, Al^3+ instead of Al3+) for semantic lookup. The formula field remains as-shown in OpenStax for display rendering through 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