What is the relationship between enthalpy change and heat at constant pressure?

What is the relationship between enthalpy change and heat at constant pressure?

Step 1: Understand what enthalpy (H) is. It is a measure of the total energy of a system, including internal energy and the energy required to make room for it by displacing its environment.
Step 2: Know that enthalpy change (ΔH) refers to the difference in enthalpy between the final and initial states of a system.
Step 3: Recognize that heat (Q) is the energy transferred between a system and its surroundings due to a temperature difference.
Step 4: Learn that at constant pressure, the heat exchanged (Q) during a process is directly related to the change in enthalpy (ΔH).
Step 5: Conclude that when pressure remains constant, the amount of heat added or removed from the system is equal to the change in enthalpy: ΔH = Q.

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