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What is the change in internal energy (ΔU) for an ideal gas during an isothermal

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Question: What is the change in internal energy (ΔU) for an ideal gas during an isothermal process? (2021)

Options:

  1. ΔU = 0
  2. ΔU = nRT
  3. ΔU = -nRT
  4. ΔU = PV

Correct Answer: ΔU = 0

Exam Year: 2021

Solution: 

In an isothermal process for an ideal gas, the temperature remains constant, which means the internal energy does not change. Therefore, ΔU = 0.

What is the change in internal energy (ΔU) for an ideal gas during an isothermal

Practice Questions

Q1
What is the change in internal energy (ΔU) for an ideal gas during an isothermal process? (2021)
  1. ΔU = 0
  2. ΔU = nRT
  3. ΔU = -nRT
  4. ΔU = PV

Questions & Step-by-Step Solutions

What is the change in internal energy (ΔU) for an ideal gas during an isothermal process? (2021)
  • Step 1: Understand what an isothermal process is. It is a process where the temperature of the system remains constant.
  • Step 2: Know that for an ideal gas, the internal energy (U) depends only on temperature.
  • Step 3: Since the temperature does not change in an isothermal process, the internal energy also does not change.
  • Step 4: Therefore, the change in internal energy (ΔU) is equal to 0.
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