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Homework Help: Adiabatic process

  1. Dec 4, 2008 #1
    1. The problem statement, all variables and given/known data
    twenty moles of a monatomic ideal gas (lambda=5/3) undergo an adiabatic process the initial pressure is 400kpa and the initial temperature is 450K. The final temperature of the gas is 320K.
    The heat absorbed by the gas in kJ is closest to?

    2. Relevant equations

    3. The attempt at a solution
    I think this is suppose to be a trick question. I thought an adiabatic process ment zero heat was gained or lost. Therefore shouldn't the answer be zero regardless of the temperature, moles, or pressure values given?
  2. jcsd
  3. Dec 5, 2008 #2


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    Homework Helper

    An adiabatic process won't add or take heat away from a gas. It doesn't mean that the gas itself cannot change temperature as a result of say an increase in pressure. Since the question asks how much was absorbed and they have indicated it is adiabatic, then ... 0 looks to be the answer.
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