Heat transferred into a closed system

  • #1
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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 ?
 

Answers and Replies

  • #2
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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 ?
Using the first law of thermodynamics, how would you answer this question?
 
  • #3
169
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Using the first law of thermodynamics, how would you answer this question?
well using the first law Q-W=ΔU, Q will equal to to ΔU+ W but i dont know how to calculate ΔU
 
  • #4
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well using the first law Q-W=ΔU, Q will equal to to ΔU+ W but i dont know how to calculate ΔU
For one mole of an ideal gas, ##\Delta U =C_v(T_f-T_i)##. Now what?
 
  • #5
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For one mole of an ideal gas, ##\Delta U =C_v(T_f-T_i)##. Now what?
why use Cv not Cp the system has constant pressure and variable volume
 
  • #6
20,874
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why use Cv not Cp the system has constant pressure and variable volume
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?
 
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