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1. The problem statement, all variables and given/known data

What are the values of the entropy changes (system, surroundings, and universe) for the cooling of 1 mol of O2 (g) from 298 K to O2 (l) at 90.19 K if the process is done

a. Reversibly

b. Irreversibly

by placing the sample in liquid hydrogen at 13.96 K? Assume enthalpy change of vaporization is 6820 j/mol at 90.19 K and Cp = 7/2 R for the gas.

2. Relevant equations

How do you solve this problem for all types of entropy?(entropy changes (system, surroundings, and universe)

3. The attempt at a solution

Have no clue how to start it. Please help!!!!

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Thermodynamics for P Chem NEEd HELP By tomorrow

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