Heat is the amount of energy transferred from and to the object or the substance of the system. When heat flows into a system its value is positive.
Change in the free energy of the system is shown as [tex]\rm (\Delta G)[/tex] it tells about the reversible work performed by the system in thermodynamically constant pressure and temperature.
The enthalpy is equal to the heat formation and is shown as [tex]\rm (\Delta H)[/tex]. It represents the total heat content of the reaction and enthalpy change of the final and the initial system.
Q or the heat when flows in the system for the reaction is a positive value as the energy of the system gets increased while when the heat is released from the reaction then the value is negative as the energy decreases.
Therefore, heat transfer to the system is positive.
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