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B Heat transferred into a closed system

  1. May 6, 2016 #1
    So i am making a simple demonstration of ideal gas law using a cylinder piston system, heating the system so the piston is pushed up, i wanted to calculate the heat transferred into the system, will it be Cp(Tf-Ti) or Cp(Tf-Ti)+ work done by the system ?
  2. jcsd
  3. May 6, 2016 #2
    Using the first law of thermodynamics, how would you answer this question?
  4. May 6, 2016 #3
    well using the first law Q-W=ΔU, Q will equal to to ΔU+ W but i dont know how to calculate ΔU
  5. May 6, 2016 #4
    For one mole of an ideal gas, ##\Delta U =C_v(T_f-T_i)##. Now what?
  6. May 6, 2016 #5
    why use Cv not Cp the system has constant pressure and variable volume
  7. May 6, 2016 #6
    The internal energy of an ideal gas is (a) a function of temperature only or (b) a function of temperature and volume (per unit mass)?

    For constant pressure, what is the amount of work that is done?
    Last edited: May 6, 2016
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