Isotope Browser vs Reaction Thermodynamics

Provided by the Nuclear Data Section of the International Atomic Energy Agency, the app gives properties of more than 4 000 nuclides and isomers. A Chart of Nuclides, with zooming and tapping enabled, and a Periodic Table of Elements are included to allow easy selection and navigation. Filter criteria on half-life, decay mode, radiation type and energy can be selected. Summary data are presented in a scrolling list, with a details page for each nuclide containing web links to the data sources and further information such as level and decay schema. The filtered nuclides can be visualised on the Chart of Nuclides. Data are taken from the most recent and reliable sources, and optimal search-and-retrieve performance is achieved with an embedded database, meaning that no network connection is required.

Reaction Thermodynamics helps in evaluation of main thermodynamic parameters of a chemical reaction.  Application calculates the following parameters: - Standard free Gibbs energy, enthalpy and entropy from formation energy parameters. - Reaction quotient (Q) from concentrations, pressures and reaction stoichiometry. - Non standard energy parameters (dG, dH, dS) from standard ones, quotient and temperature. - Reaction equilibrium constant, Keq. - Van't Hoff relation to follow change in equilibrium constant with temperature assuming constant reaction enthalpy. List of Formulas: Quotient = Π(C, P) ΔGº = Σ(ΔGºf) ΔHº = Σ(ΔHºf) ΔSº = Σ(Sºf) ΔG = ΔH – TΔS ΔGº = - RTlnKeq Keq = e^(-ΔGº/RT) ΔG = ΔGº + RTlnQ ΔGº = ΔHº – TΔSº ΔHº = ΔGº + TΔSº ΔSº = (ΔHº - ΔGº)/T Keq2 = Keq⋅e^(ΔHº/R⋅(1/T1 - 1/T2))" Scrolling to the required formula and pressing run button initiates calculation according to the formula and set results in the appropriate fields ((dG°, dH°, dS°, Keq, dG, dH, dS, Keq2) and in the fields for standard parameters. Please pay attention to the parameters needed for solution of the formulas. If formation parameters are unknown, the standard parameters can be filled in directly. The default units are kJ/mole for dG and dH, kJ/Kmole for dS. Keq units depend on reaction stoichiometry and may be unitless or any mixture of Molar and atm. Important!!! If compound doesn't participate in equilibrium calculation (like in case of water in water solution or solid in gas phase reaction) please set concentration of the compound to 1 or set its stoichiometric coefficient to 0 (depends on case) to ensure proper Quotient calculations. Ask developer directly in case of a ambiguity. Reaction stoichiometric parameters and concentration/pressure units can be changed by pressing the corresponding fields. For further details please refer to www.volard.wordpress.com