Calculate the final temperature and volume

[kingyof2thejring]

Homework Statement

One mole of a perfect gas with molar heat capacity at constant volume, CV = 20.8 J K-1mole-1 is initially at 310 K and 3.25 x 105 Pa. It then expands adiabatically until it reaches a pressure of 2.50 x 105 Pa.
Calculate the final temperature and volume, and the work done.

Homework Equations

U(internal energy)=3/2RT
pV=RT

The Attempt at a Solution

to get the initial V do i use pV=RT?
Is work done = internal energy in an adiabatic process WD=3/2RT?
thanks in advance

 

[Dick]

If the system exchanges no heat energy with it's surroundings, then how could your conclusion be wrong?

 

[Andrew Mason]

Homework Equations

U(internal energy)=3/2RT
U = nC_vT = (3n/2)RT
pV=nRT

The Attempt at a Solution

to get the initial V do i use pV=RT?
Is work done = internal energy in an adiabatic process WD=3/2RT?
thanks in advance

You have to use n: PV = nRT and W = 3n/2 RT

AM

 

[karthikmece]

Is there anyone who can help me in this regard...this is the first message i am posting in this forum

I want to calculate internal energy of an ideal gas. Are there any formulae for that or is there any method to calculate internal energy.

Thanks in advance if anyone can help me in this regard.

 

[Dick]

Is there anyone who can help me in this regard...this is the first message i am posting in this forum

I want to calculate internal energy of an ideal gas. Are there any formulae for that or is there any method to calculate internal energy.

Thanks in advance if anyone can help me in this regard.

If you are going to ask a new question - start a new thread. But, yes, there is a formula for internal energy of an ideal gas. Look it up. Or just look at the preceding posts...