A system with 20,000 molecules has two energy levels (A and B). At first, energy level A is populated by 60% of the molecules. After a reversible process, energy level A is populated by 90% of the molecules and the system is at 373 K.
a. What is the difference in energy between the two levels?
Provide your answer in J/mol.
b. What is the change in the total energy of the system?
c. What is the change in entropy?
Hint: After the reversible process, the system should reach equilibrium and follows the Boltzmann distribution.
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