Chemistry – Chemical energetics - Exothermic and endothermic reactions | e-Consult
Chemical energetics - Exothermic and endothermic reactions (1 questions)
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The ΔH value of -150 kJ indicates that the reaction is exothermic.
This is because ΔH is defined as the heat released during a reaction. The negative sign signifies that heat is leaving the system (the reaction vessel) and being transferred to the surroundings. Therefore, the products have lower enthalpy than the reactants, and energy is released in the form of heat.