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What is the relationship between enthalpy and internal energy at constant pressu

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Question: What is the relationship between enthalpy and internal energy at constant pressure?

Options:

  1. ΔH = ΔU + PΔV.
  2. ΔH = ΔU - PΔV.
  3. ΔH = ΔU.
  4. ΔH = PΔV.

Correct Answer: ΔH = ΔU + PΔV.

Solution: 

At constant pressure, the change in enthalpy (ΔH) is related to the change in internal energy (ΔU) and the pressure-volume work done (PΔV) by the equation ΔH = ΔU + PΔV.

What is the relationship between enthalpy and internal energy at constant pressu

Practice Questions

Q1
What is the relationship between enthalpy and internal energy at constant pressure?
  1. ΔH = ΔU + PΔV.
  2. ΔH = ΔU - PΔV.
  3. ΔH = ΔU.
  4. ΔH = PΔV.

Questions & Step-by-Step Solutions

What is the relationship between enthalpy and internal energy at constant pressure?
  • Step 1: Understand that enthalpy (H) is a measure of total energy in a system, including internal energy and the energy required to make space for it (pressure-volume work).
  • Step 2: Recognize that internal energy (U) is the energy contained within the system itself, excluding any work done by the system on its surroundings.
  • Step 3: At constant pressure, the change in enthalpy (ΔH) can be expressed as the change in internal energy (ΔU) plus the work done due to volume change (PΔV).
  • Step 4: The equation that relates these quantities is ΔH = ΔU + PΔV.
  • Step 5: This means that if you know how much the internal energy changes and how much work is done due to volume change, you can find the change in enthalpy.
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