Entropy Calculator

Calculate entropy change (ΔS) for thermodynamic processes. Calculate for isothermal processes (ΔS = Q_rev/T), phase changes (melting/vaporization), temperature changes (heating/cooling), gas expansion/compression, mixing of ideal gases, and chemical reactions using standard molar entropies. Features standard entropy values for 15+ substances, spontaneity prediction, and step-by-step solutions. Perfect for chemistry and physics students.