In a closed system, if 100 J of heat is added and 40 J of work is done by the sy

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Question: In a closed system, if 100 J of heat is added and 40 J of work is done by the system, what is the change in internal energy? (2022)

Options:

Correct Answer: 60 J

Solution:

According to the First Law of Thermodynamics, ΔU = Q - W. Here, ΔU = 100 J - 40 J = 60 J.

In a closed system, if 100 J of heat is added and 40 J of work is done by the system, what is the change in internal energy? (2022)

In a closed system, if 100 J of heat is added and 40 J of work is done by the system, what is the change in internal energy? (2022)

Step 1: Identify the amount of heat added to the system. In this case, it is 100 J.
Step 2: Identify the amount of work done by the system. Here, it is 40 J.
Step 3: Recall the First Law of Thermodynamics formula: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat added, and W is the work done by the system.
Step 4: Substitute the values into the formula: ΔU = 100 J - 40 J.
Step 5: Perform the calculation: 100 J - 40 J = 60 J.
Step 6: Conclude that the change in internal energy (ΔU) is 60 J.

First Law of Thermodynamics – The principle that energy cannot be created or destroyed, only transformed, expressed as ΔU = Q - W.