What is the relationship between ΔH and ΔU for a reaction at constant pressure?

Practice Questions

Q1
What is the relationship between ΔH and ΔU for a reaction 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 ΔH and ΔU for a reaction at constant pressure?
  • Step 1: Understand that ΔH is the change in enthalpy and ΔU is the change in internal energy of a system.
  • Step 2: Recognize that at constant pressure, the enthalpy change (ΔH) can be related to the internal energy change (ΔU).
  • Step 3: Know that the formula connecting these two is ΔH = ΔU + PΔV.
  • Step 4: Identify that P is the pressure and ΔV is the change in volume of the system during the reaction.
  • Step 5: Conclude that this formula shows how the change in enthalpy accounts for both the change in internal energy and the work done due to volume change at constant pressure.
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