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

💡 Solution & Explanation

For spontaneity, Δ G = Δ H - T * Δ S < 0. If Δ H > 0 and Δ S < 0, then both terms Δ H and -T * Δ S are positive, making Δ G positive at all temperatures. Thus, spontaneity is impossible.