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Postby Himanshu_Shukla » Fri Jul 25, 2014 11:06 am

The gas used in separating the two uranium isotopes 23'U
and 238U has the formula UF6. Ifyou added heat at equal rates to a
mole of UF6 gas and a mole of H2 gas, which one's temperature
would you expect to rise faster? Explain.

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Joined: Tue Sep 01, 2015 10:37 am

Re: thermodynamics!

Postby Chiron » Tue Sep 01, 2015 11:26 am

I realize that this is an older post, but I will respond in the hopes my solution may be helpful to other readers.

I'm not entirely sure, but I believe that the important factor may be the size difference of UF_6 and H_2. If we look at the Equation of State for Gas with nonzero size and a pairwise attractive force $\left( P + \dfrac{N^2 a}{V^2} \right) \left(V - N b\right) = N k_B T$ where a is the force between particles and b is the size of the particles. We then note that for UF_6 the size is bigger and thus the volume portion should become smaller than for H_2. I would therefore assume that the temperature of H_2 should rise faster.

I hope this makes sense. If anyone has any questions, or sees a flaw in this argument, please feel free to reply.


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