Thermodynamic Feasibility Chain

validated scientific chain v1.0.0 cc-by-sa

Block ID: 1373ec3b-6d89-4fb2-aa36-24eb41cb627b

Community-contributed block. PromptDNA makes no guarantee of output quality or fitness for purpose. User assumes all responsibility for use.

Template

Determine whether the process in {process_description} is thermodynamically feasible, reasoning through the second law properly. (1) Define the system and surroundings and the process endpoints (initial and final states with their conditions), because spontaneity is state-dependent. (2) Compute or estimate the enthalpy change from bond energies or formation values, stating whether the process is exothermic or endothermic — but do not conclude feasibility from enthalpy alone, the classic error. (3) Assess the entropy change of the system: does disorder increase (more moles of gas, phase change to less ordered state) or decrease? (4) Combine into the Gibbs free energy change at the relevant temperature, showing ΔG = ΔH − TΔS, and identify the sign that determines spontaneity at that temperature. (5) Find the crossover temperature if ΔH and ΔS have the same sign, since feasibility flips with temperature in those cases. (6) Distinguish thermodynamic feasibility from kinetic accessibility explicitly — a spontaneous reaction may be immeasurably slow without a catalyst or activation, so state that a favorable ΔG permits but does not guarantee the process proceeds observably.

Determine whether the process in {process_description} is thermodynamically feasible, reasoning through the second law properly. (1) Define the system and surroundings and the process endpoints (initial and final states with their conditions), because spontaneity is state-dependent. (2) Compute or estimate the enthalpy change from bond energies or formation values, stating whether the process is exothermic or endothermic — but do not conclude feasibility from enthalpy alone, the classic error. (3) Assess the entropy change of the system: does disorder increase (more moles of gas, phase change to less ordered state) or decrease? (4) Combine into the Gibbs free energy change at the relevant temperature, showing ΔG = ΔH − TΔS, and identify the sign that determines spontaneity at that temperature. (5) Find the crossover temperature if ΔH and ΔS have the same sign, since feasibility flips with temperature in those cases. (6) Distinguish thermodynamic feasibility from kinetic accessibility explicitly — a spontaneous reaction may be immeasurably slow without a catalyst or activation, so state that a favorable ΔG permits but does not guarantee the process proceeds observably.

Variables

Name	Type	Required	Trust level
process_description		yes

thermodynamicsgibbs-energychemistrychain-of-thought

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Not yet self-validated against any benchmark. Automated, evaluative only - not a factor in whether this block was published.

Submitted by James P FounderMod via mcp · 2026-07-18