What is the relationship between enthalpy change and internal energy change at c
Practice Questions
Q1
What is the relationship between enthalpy change and internal energy change at constant pressure?
ΔH = ΔU + PΔV
ΔH = ΔU - PΔV
ΔH = ΔU
ΔH = PΔV
Questions & Step-by-Step Solutions
What is the relationship between enthalpy change and internal energy change at constant pressure?
Correct Answer: ΔH = ΔU + PΔV
Step 1: Understand that enthalpy (H) is a measure of total energy in a system, including internal energy (U) and the energy needed to make space for the system (PV).
Step 2: Recognize that at constant pressure, the change in enthalpy (ΔH) can be calculated using the formula ΔH = ΔU + PΔV.
Step 3: Identify that ΔU is the change in internal energy, P is the pressure, and ΔV is the change in volume of the system.
Step 4: Realize that this formula shows how changes in internal energy and volume at constant pressure affect the overall energy change (enthalpy) of the system.
