{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.standard-molar-entropy","code":"thing-q764278","url":"https://ver.cy/models/thing/q764278/","name":"standard molar entropy","alternateNames":[],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.REL"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The entropy of one mole of a substance in its standard state at a specified temperature, usually 298.15 K and 1 bar, measured in joules per kelvin per mole and determined from heat capacity measurements from absolute zero; standard molar entropies are tabulated and used to compute reaction entropies and Gibbs free energies.","purpose":"Let an agent explain standard molar entropy, use tabulated values to compute reaction entropy changes, and relate entropy to spontaneity and thermodynamic trends.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Absolute entropy per mole","Standard state","From third law measurements","Tabulated"],"structure":{"bundles":[{"id":"define","name":"Define","description":"What it is.","layers":[{"id":"definition","name":"Definition","description":"Definition and units.","findings":[{"id":"definition-finding","name":"Definition","description":"Definition.","questions":[{"text":"How is standard molar entropy defined, and what standard state applies?","kind":"definition"},{"text":"Why are values absolute rather than relative?","kind":"definition"}]}]},{"id":"measure","name":"Measure","description":"How it is determined.","findings":[{"id":"measure-finding","name":"Measure","description":"Measurement.","questions":[{"text":"How are standard molar entropies determined from heat capacity data?","kind":"provenance"},{"text":"What is residual entropy?","kind":"definition"}]}]}]},{"id":"compute","name":"Compute","description":"Reaction entropy.","layers":[{"id":"reaction","name":"Reaction","description":"Entropy change.","findings":[{"id":"reaction-finding","name":"Reaction","description":"Reaction entropy.","questions":[{"text":"What is the standard entropy change of this reaction from tabulated values?","kind":"measurement"},{"text":"Is the sign consistent with the change in gas moles?","kind":"boundary"}]}]},{"id":"gibbs","name":"Gibbs","description":"Free energy.","findings":[{"id":"gibbs-finding","name":"Gibbs","description":"Free energy.","questions":[{"text":"How does the entropy change combine with enthalpy to give the Gibbs free energy?","kind":"definition"},{"text":"At what temperature does the reaction become spontaneous?","kind":"measurement"}]}]}]},{"id":"trends","name":"Trends","description":"Patterns.","layers":[{"id":"state","name":"State","description":"Gases, liquids, solids.","findings":[{"id":"state-finding","name":"State","description":"Physical state.","questions":[{"text":"Why do gases have higher standard molar entropies than liquids and solids?","kind":"definition"},{"text":"How do molecular complexity and mass affect entropy?","kind":"definition"}]}]},{"id":"temperature","name":"Temperature","description":"Temperature dependence.","findings":[{"id":"temperature-finding","name":"Temperature","description":"Temperature dependence.","questions":[{"text":"How does molar entropy change with temperature?","kind":"definition"},{"text":"How is it corrected to other temperatures?","kind":"action"}]}]}]},{"id":"data","name":"Data","description":"Tables and teaching.","layers":[{"id":"tables","name":"Tables","description":"Data sources.","findings":[{"id":"tables-finding","name":"Tables","description":"Data sources.","questions":[{"text":"Which compilations give standard molar entropies, and which conventions do they use?","kind":"provenance"},{"text":"How consistent are values between sources?","kind":"boundary"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can entropy be taught with worked examples?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Report standard molar entropies from reference tables, citing the source, temperature and pressure.","Use them in thermodynamic calculations with consistent standard states."],"mustNot":["Mix data at different standard pressures, such as 1 bar and 1 atm, without saying so.","Invent entropy values where no measurement exists.","Use thermodynamic predictions to sign off a hazardous process without expert review."],"requiresHuman":["Relying on calculated values for the design of a process that could cause harm if wrong."]},"ethics":{"considerations":["Wrong thermodynamic data can make chemical plants unsafe.","Students rely on correct reference values."],"affectedParties":["Chemists and engineers","Students","Workers near chemical processes"]},"owners":{"steward":"Nobody owns the quantity; reference data are compiled by scientific data bodies.","roles":[],"masterSystems":[]},"relations":[{"target":"Q68972876","type":"parent","note":"registry parent class"},{"target":"molar entropy","type":"related","note":"category"},{"target":"adiabaticity","type":"related","note":"entropy in processes"},{"target":"melting","type":"related","note":"entropy of phase change"},{"target":"metric","type":"related","note":"SI units"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.standard-molar-entropy","Wikidata: Q764278 (https://www.wikidata.org/wiki/Q764278)"]},"properties":{"applicability":"not-applicable","items":["standard conditions: 298.15 K, 1 bar - conventional"]},"recognition":{"applicability":"optional","items":["Symbol S with a standard-state mark","Units of J/(K mol)","Entropy of formation is not defined the same way as enthalpy of formation","Not physical; values in thermodynamic tables."]},"capabilities":{"applicability":"required","items":["look up and use standard molar entropies","compute reaction entropy changes","explain trends across substances","relate entropy to Gibbs free energy"]},"hazards":{"applicability":"required","items":["Mixing standard pressure conventions","Sign errors in reaction entropy","Confusing molar and specific entropy"]},"interfaces":{"applicability":"required","items":["IUPAC standard state conventions","Thermodynamic data compilations such as NIST-JANAF"]},"context":{"applicability":"required","items":["Chemical thermodynamics.","standard molar entropies of elements","standard molar entropies of compounds","entropies of gases, liquids and solids","aqueous ion entropies"]}},"sources":[{"title":"Wikidata item Q764278: standard molar entropy","url":"https://www.wikidata.org/wiki/Q764278","note":"identity and sense of the item"},{"title":"Wikipedia: Standard molar entropy","url":"https://en.wikipedia.org/wiki/Standard_molar_entropy","note":"general description of the item"}],"openQuestions":["Should entropy be a separate entry?","How should data tables be linked?","How should convention differences be recorded?"],"resources":{"spec":"/models/things/publications/thing-q764278/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q764278/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T19:45:32Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:52:02+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}