Gas in tank exposed to a vacuum

[GZunich]

Homework Statement

A tank is equally divided into two equal halves, one a vacuum and one filled with argon gas at 298K and 700 bar. The divider bursts and the gas equally disperses throughout the tank. What is the new T and P of the gas assuming argon is an ideal gas?

Homework Equations

PV=nRT P1V1/T1=P2V2/T2

The Attempt at a Solution

I assumed there was no temperature change which I am unsure of but using that logic, P=350 bar and T=298K

 

[rude man]

Begin with the definition of an ideal gas. Hint: it's more than just pV = nRT.
What can you say about the dependence of U, internal energy, as a function of p,V and/or T?
Then go with the first law and show that you get the same results whether the free expansion is adiabatic or isothermal or anything inbetween.

 

[rude man]

Homework Statement

A tank is equally divided into two equal halves, one a vacuum and one filled with argon gas at 298K and 700 bar. The divider bursts and the gas equally disperses throughout the tank. What is the new T and P of the gas assuming argon is an ideal gas?

Homework Equations

PV=nRT P1V1/T1=P2V2/T2

The Attempt at a Solution

I assumed there was no temperature change which I am unsure of but using that logic, P=350 bar and T=298K

You can't make that assumption unless you can prove it.

Begin with the definition of an ideal gas. Hint: it's more than just pV = nRT.

What can you say about the dependence of U, internal energy, as a function of p,V and/or T?

Then go with the first law and determine if you get the same results whether the free expansion is adiabatic or isothermal or anything inbetween.