What is the change in enthalpy for the reaction at constant pressure?

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Question: What is the change in enthalpy for the reaction at constant pressure?

Options:

Correct Answer: It is equal to the heat absorbed or released.

Solution:

At constant pressure, the change in enthalpy (ΔH) is defined as the heat absorbed or released by the system.

What is the change in enthalpy for the reaction at constant pressure?

What is the change in enthalpy for the reaction at constant pressure?

Step 1: Understand that enthalpy (H) 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: Recognize that the change in enthalpy (ΔH) occurs during a chemical reaction at constant pressure.
Step 3: Know that ΔH represents the heat absorbed or released by the system during the reaction.
Step 4: If the reaction absorbs heat, ΔH is positive (endothermic). If it releases heat, ΔH is negative (exothermic).
Step 5: Use the formula ΔH = q_p, where q_p is the heat exchanged at constant pressure.

Enthalpy Change – The change in enthalpy (ΔH) at constant pressure is equal to the heat exchanged by the system.
Constant Pressure Conditions – Understanding that ΔH is specifically defined under constant pressure conditions, which is a common scenario in thermodynamic reactions.