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Homework Statement
A model universe comprises 100 atoms in system 1 and 1500 atoms in system 2. Compute the entropy for the universe when there are 3 atoms on in system 2 and 97 atoms on in system 1 (using sterlings approximation).
The Attempt at a Solution
I am able to find the entropy of systems 1 and 2 by initially finding the number of microstates and then the equation:
entropy = boltzmanns * ln(microstates)
Just wondering how I would get the entropy of the universe though.