Heat transferred into a closed system

[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 ?

 

[Chestermiller]

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?

 

[abdo799]

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

 

[Chestermiller]

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?

 

[abdo799]

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

 

[Chestermiller]

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?