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In a constant pressure process, how is the work done by the system related to th

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Question: In a constant pressure process, how is the work done by the system related to the change in enthalpy?

Options:

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

Correct Answer: W = ΔH - PΔV

Solution: 

For a constant pressure process, the work done by the system is related to the change in enthalpy by the equation ΔH = Q + PΔV, where Q is the heat added.

In a constant pressure process, how is the work done by the system related to th

Practice Questions

Q1
In a constant pressure process, how is the work done by the system related to the change in enthalpy?
  1. W = ΔH
  2. W = -ΔH
  3. W = ΔH + PΔV
  4. W = ΔH - PΔV

Questions & Step-by-Step Solutions

In a constant pressure process, how is the work done by the system related to the change in enthalpy?
  • Step 1: Understand that in a constant pressure process, the pressure remains the same throughout the process.
  • Step 2: Know 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 3: Recognize that the change in enthalpy (ΔH) is calculated as the difference between the final and initial enthalpy of the system.
  • Step 4: Learn that the work done by the system (W) during a constant pressure process is related to the change in volume (ΔV) of the system, specifically W = PΔV, where P is the constant pressure.
  • Step 5: Combine the concepts: The heat added to the system (Q) at constant pressure is related to the change in enthalpy and the work done by the system. This is expressed in the equation ΔH = Q + PΔV.
  • Step 6: Conclude that in a constant pressure process, the work done by the system contributes to the change in enthalpy along with the heat added.
  • Constant Pressure Process – A thermodynamic process that occurs at a constant pressure, where the work done by the system can be directly related to changes in enthalpy.
  • Enthalpy (ΔH) – A thermodynamic quantity that represents the total heat content of a system, which is useful for understanding energy changes during processes at constant pressure.
  • Work Done (PΔV) – The work done by the system during expansion or compression, calculated as the product of pressure and the change in volume.
  • Heat Transfer (Q) – The amount of energy transferred into or out of the system, which affects the internal energy and enthalpy of the system.
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