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The enthalpy of a reaction is measured when the reaction is carried out with constant pressure. A calorimeter can ensure that the pressure and volume is held constant. When you measure the energy in the system, it is the internal energy; to convert it to the enthalpy of the reaction, you add the changes in pressure and volume, which in this case would be zero. You must take this into account, but for the most part, in an open system, you can assume the volume and pressure is held constant.
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