Consider the following processes of ideal gases. which of these processes leads to an increase in entropy? select all of the correct answers.

a glass of water loses 100 j of energy reversibly at 30°c.
the pressure of one mole of oxygen gas is allowed to double isothermally.
nitrogen gas is compressed isothermally to one half its original volume.
carbon dioxide is allowed to expand isothermally to 10 times its original volume.