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The first law of thermodynamics can be written as $ \Delta U = \Delta Q + \Delta W$ for an ideal gas. Which of the following statements is correct?
  • A$\Delta U$ is always zero when no heat enters or leaves the gas
  • B$\Delta W$ is the work done by the gas in this written law.
  • C$\Delta U$ is zero when heat is supplied and the temperature stays constant
  • D$\Delta Q = -\Delta W$ when the temperature increases very slowly.
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