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Enthalpy of a reaction or energy change of a reaction D H, is the amount of energy or heat absorbed in a reaction. If the energy is required, D H is positive, and if energy is released, the D H, is negative.
The enthalpy or reaction is the change in enthalpy for a reaction at a given temperature and pressure. This change in enthalpy is denoted as ïH. The relationship between heat and enthalpy is that the enthalpy of reaction equals the heat of reaction at constant pressure.uestion 1. Use Hessâs law and the measured mean ïH values for reactions a and b to calculate ïH for reaction C. 2NaOH (aq) + (NH 4) 2 SO 4 (aq) ï® Na 2 SO 4 (aq) + 2NH 3 (aq) + 2H 2 O (â).