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**1. Homework Statement**

A NON-monatomic gas expands from I to F in the Figure (Since it is not monatomic U=3/2nRT does not give you the internal energy, this only works for monatomic gases, instead you must use the first law). The energy added to the gas by heat is 424 J when the gas goes from I to F along the diagonal path.

Picture/Figure: http://www.webassign.net/sf/p12_05.gif

**2. Homework Equations**

**3. The Attempt at a Solution**

well i tried using ∆U=Q+W(on) and doing all the possible combinations of positive and negative (finding work from area under curve) but I couldn't get the correct answer for ∆U. I hope you can help!!

thanks so much

--aweg