(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In part a) to this question I calculated the partition function which is Z = 1 + 3/e + 5/e^2

2. Relevant equations

I can't find an equation relating U to Z.

3. The attempt at a solution

If someone has an explanation or a link to an equation that would be great. Thanks.

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# Finding the energy of a system using the partition function

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