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Looking up compound thermochemistryTo look up a compound's thermochemical properties enter its chemical formula or name and click 'Lookup'. In chemical formula you may use:
- Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
- Functional groups: D, T, Ph, Me, Et, Bu, AcAc, For, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
- parenthesis () or brackets [].
- Common compound names.
Examples of compounds with thermochemical data: H2O, CO2, CH4, NH3, Al, NaCl, CaCO3, Al2O3, Sulfur, Potassium permanganate.
Compound thermochemistry lookup provides thermodynamic data for chemical compounds.Thermochemical Properties
This tool provides the following thermodynamic properties:
- Enthalpy of formation (ΔH°f): The energy change when 1 mole of a compound is formed from its elements in their standard states
- Gibbs free energy (ΔG°f): The maximum amount of work that can be extracted from a thermodynamic system
- Standard entropy (S°): A measure of the disorder or randomness of a system
- Heat capacity (Cp°): The amount of heat required to raise the temperature of 1 mole of substance by 1 K
What is thermochemistry?
Thermochemistry is the study of the heat changes that accompany chemical reactions and physical transformations. These properties are fundamental for understanding chemical processes, reaction spontaneity, and energy requirements. Standard thermodynamic data is typically measured at 25°C (298.15 K) and 1 atm pressure. Applications of thermochemical data
Thermochemical properties are used for:
- Reaction prediction: Determining if a reaction will occur spontaneously
- Energy calculations: Computing heat released or absorbed in reactions
- Equilibrium constants: Calculating equilibrium positions from thermodynamic data
- Process design: Engineering chemical processes and optimizing conditions
- Material properties: Understanding thermal behavior of materials
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