Which of the following conditions definitively guarantees that a process is completely thermodynamic — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

The Second Law of Thermodynamics states that for a perfectly reversible process (which is essentially a system at continuous equilibrium with its surroundings), the total entropy change of the universe ($\Delta S_{sys} + \Delta S_{surr}$) must be exactly zero.