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If 100 J of heat is added to a system and 40 J of work is done by the system, wh

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Question: If 100 J of heat is added to a system and 40 J of work is done by the system, what is the change in internal energy?

Options:

  1. 60 J
  2. 40 J
  3. 100 J
  4. 140 J

Correct Answer: 60 J

Solution: 

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

If 100 J of heat is added to a system and 40 J of work is done by the system, wh

Practice Questions

Q1
If 100 J of heat is added to a system and 40 J of work is done by the system, what is the change in internal energy?
  1. 60 J
  2. 40 J
  3. 100 J
  4. 140 J

Questions & Step-by-Step Solutions

If 100 J of heat is added to a system and 40 J of work is done by the system, what is the change in internal energy?
  • Step 1: Identify the amount of heat added to the system, which is 100 J. This is represented as Q.
  • Step 2: Identify the amount of work done by the system, which is 40 J. This is represented as W.
  • Step 3: Use the First Law of Thermodynamics formula, which is ΔU = Q - W.
  • Step 4: Substitute the values into the formula: ΔU = 100 J - 40 J.
  • Step 5: Calculate the result: ΔU = 60 J.
  • First Law of Thermodynamics – The First Law states that the change in internal energy (ΔU) of a system is equal to the heat added to the system (Q) minus the work done by the system (W).
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