A spontaneous reaction is impossible if — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

For a reaction to be spontaneous, $\Delta G = \Delta H - T\Delta S$ must be negative. If $\Delta H$ is positive (endothermic) and $\Delta S$ is negative (decreasing disorder), $\Delta G$ will always be positive regardless of the absolute temperature, making spontaneity impossible.