# Heat transferred into a closed system

• Axe199

#### Axe199

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 ?

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?

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 don't know how to calculate ΔU

well using the first law Q-W=ΔU, Q will equal to to ΔU+ W but i don't know how to calculate ΔU
For one mole of an ideal gas, ##\Delta U =C_v(T_f-T_i)##. Now what?

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

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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