How is the enthalpy change of a substance calculated?
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For calculating the enthalpy change per mole of a substance X in an interaction between two substances X and Y, these substances are independently transferred to a calorimeter. The initial and final temperature readings are noted. The value of the energy absorbed or dissipated during the reaction can be calculated by multiplying the specific heat capacities of the substances by the mass and the temperature change. Dividing the mole number of X by the energy change gives an enthalpy change of reaction.