Thermodynamics — Set 2

When an ideal gas expands freely into a vacuum, what is the work done by the gas?

For a reversible adiabatic process of an ideal gas, which relation is correct?

What is the efficiency of a Carnot engine operating between hot reservoir Th and cold reservoir Tc (in kelvin)?

The coefficient of performance (COP) of a refrigerator is defined as which ratio?

Which statement matches the Kelvin-Planck form of the second law of thermodynamics?

Which statement matches the Clausius form of the second law of thermodynamics?

For a reversible process, how is the infinitesimal change in entropy defined?

For a reversible process, what is the total entropy change of the universe?

For an isolated system, which statement about entropy is generally correct?

Which description best defines a reversible process?