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To determine effect of entropy

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A process run infinitesimally slowly at equilibrium and reversed to its original state

Motion of a frictionless pendulum

Evaporation of water from a cup

Solid and liquid water combined together at STP

Ice melting to water above the melting point

Isothermal expansion of a real gas

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Solution Summary

The solution explains the effect on entropy of the universe for the given processes.

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Part B: Classify each process by its individual effect on the entropy of the universe S.

Does not effect the S of the universe.
A process run infinitesimally slowly at equilibrium and reversed to its original state
...

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