Thermodynamics & Stat. Mech.

I've seen this problem before... might be able to check my old thermo notes tomorrow. Too tired to think it through from scratch tonight.

Yay thanks! It's not due until Wednesday so just if you can help me out before then. I think it's a classic problem to show you that thermodynamic temperature can be negative(on Kelvin scale) in some cases cause a later question is "when would the temp be negative."

However, just reading this I'm baffled where to even start.