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## Homework Statement

The figure(Figure 1) shows a thermodynamic process followed by 150 mg of helium. Determine the pressure (in atm) at points 1, 2, and 3. Determine the temperature (in °C) at points 1, 2, and 3.

http://imgur.com/B7lwQ

n=.0375 mol

P

_{1}=3 atm

P

_{2}=1 atm

T

_{1}=971.85 k

T

_{2}=971.85 k

V

_{1}=1000 cm^3

V

_{2}=V

_{3}=3000 cm^3

## Homework Equations

PV=nRT

## The Attempt at a Solution

I'm only on the pressure part right now. From the given chart P

_{1}=3 atm. I used PV=nRT, and got that T

_{1}and T

_{2}are 971.85 K. With that, I used ideal gas law again to get that P

_{2}=1 atm. However, I don't know how to get the pressure at point 3 since I don't know the temperature at that point. It looks like it goes through an isobaric compression from the isotherm to the adiabat to me. Any help is appreciated.

(303000)(.001)=(.0375)(8.314)T, T

_{1}=T

_{2}=971.85 K

P(.003)=(.0375)(8.314)(971.85), P

_{2}=1 atm

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