In a closed system, if the internal energy of the system increases, what can be

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Question: In a closed system, if the internal energy of the system increases, what can be said about the enthalpy?

Options:

Correct Answer: Enthalpy increases

Solution:

If the internal energy increases in a closed system, the enthalpy also increases, as ΔH = ΔU + PΔV.

In a closed system, if the internal energy of the system increases, what can be said about the enthalpy?

In a closed system, if the internal energy of the system increases, what can be said about the enthalpy?

Step 1: Understand that a closed system means no matter enters or leaves the system.
Step 2: Know that internal energy (U) is the total energy contained within the system.
Step 3: Recognize that enthalpy (H) is a measure of total energy, including internal energy and the energy needed to make space for the system (pressure and volume).
Step 4: Remember the formula for enthalpy: ΔH = ΔU + PΔV, where ΔH is the change in enthalpy, ΔU is the change in internal energy, P is pressure, and ΔV is the change in volume.
Step 5: If the internal energy (ΔU) increases, it contributes positively to the change in enthalpy (ΔH).
Step 6: Therefore, if ΔU increases, ΔH must also increase, assuming pressure and volume changes are not negative enough to offset this increase.

Internal Energy and Enthalpy Relationship – The relationship between internal energy (U) and enthalpy (H) in a closed system, expressed by the equation ΔH = ΔU + PΔV, where P is pressure and ΔV is the change in volume.