Calculates the entropy change for ideal gases under isothermal conditions and for chemical reactions using the Gibbs free energy formula.
Start with your values, or try a preset.
Enter Initial Volume (V1), Final Volume (V2), Number of Moles (n), Temperature (T), Enthalpy Change (ΔH), and Gibbs Free Energy Change (ΔG) in the units shown.
Read Entropy Change (Chemical Reaction) and Entropy Change (Ideal Gas) in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Initial Volume (V1): 1 L; Final Volume (V2): 10 L; Number of Moles (n): 1 mol; Temperature (T): 298 K; Enthalpy Change (ΔH): -100 J/mol; Gibbs Free Energy Change (ΔG): -50 J/mol
Entropy Change (Chemical Reaction): -0.1677852349 J/(mol*K); Entropy Change (Ideal Gas): 19.14369246 J/(mol*K)
Initial Volume (V1): 1 L; Final Volume (V2): 5 L; Number of Moles (n): 2 mol; Temperature (T): 500 K; Enthalpy Change (ΔH): -200 J/mol; Gibbs Free Energy Change (ΔG): -100 J/mol
Entropy Change (Chemical Reaction): -0.2 J/(mol*K); Entropy Change (Ideal Gas): 26.76173361 J/(mol*K)
Initial Volume (V1): 2 L; Final Volume (V2): 8 L; Number of Moles (n): 0.5 mol; Temperature (T): 273 K; Enthalpy Change (ΔH): -50 J/mol; Gibbs Free Energy Change (ΔG): -25 J/mol
Entropy Change (Chemical Reaction): -0.09157509158 J/(mol*K); Entropy Change (Ideal Gas): 5.762825659 J/(mol*K)
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