• Mar 19, 2026 energy change decomposition potassium hydrogencarbonate lves an endothermic enthalpy change. Experimental data: The enthalpy change for the decomposition of KHCO₃ is approximately +25 kJ/mol, indicating an endothermic process requiring heat input. Entropy Change (ΔS) Entropy measures the disorder or randomness in a system: The de By Phillip Wilkinson-Kris
