What is the change in enthalpy for the reaction at constant pressure?
Practice Questions
1 question
Q1
What is the change in enthalpy for the reaction at constant pressure?
It is equal to the heat absorbed or released.
It is equal to the work done on the system.
It is always negative.
It is independent of the path taken.
At constant pressure, the change in enthalpy (ΔH) is defined as the heat absorbed or released by the system.
Questions & Step-by-step Solutions
1 item
Q
Q: What is the change in enthalpy for the reaction at constant pressure?
Solution: At constant pressure, the change in enthalpy (ΔH) is defined as the heat absorbed or released by the system.
Steps: 5
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.
