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September 30, 2014

September 30, 2014

Posted by **Annie** on Sunday, October 4, 2009 at 2:13am.

What is the final temperature of the gas?

Use R= 8.3145J/(mol*K) for the ideal gas constant

I'm not sure how to set this up. I tried a few ways, but all of them ended up with the wrong answer

- physics -
**drwls**, Sunday, October 4, 2009 at 7:15amThe change in internal energy (U) is equal to heat in (Q) minus work out (W).

The key to this probloem is knowing that the internal energy per mole of a MONATOMIC gas is (3/2) R T.

Thus,

delta Q = (3/2)*n* R*(delta T)

= 1300 - 2040 = -740 J

n is the number of moles and R = 8.317 J/mole K

Solve for delta T. It will be negative. I get -12 C (or K)

- physics -
**Annie**, Sunday, October 4, 2009 at 10:13amHey thanks! At one point I was using (3/2)R(deltaT) but I wasn't setting it equal to (DeltaQ).

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