# Gas expansion (Not Ideal)

#### awertag

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

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#### Andrew Mason

Homework Helper
You don't seem to have stated a question. Are you trying to find $\Delta U$?

What is the work done by the gas in going from I to F? Be careful about the units. It is then just a matter of subtracting the work done by the gas from the heat flow into the gas.

AM

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