An ideal gas contained in a piston-cylinder assembly is compressed isothermally in an internally reversible process.
(a) determine if the entropy change of the gas is greater than, equal to or less than zero, justify your answer
(b) determine if for the same change of state, the entropy change for an irreversible process is greater than, equal to or less than part (a)

a)

b) entropy of the sistem equal to a), entropy of the universe grater than a).

Explanation:

a) The change of entropy for a reversible process:

The energy balance:

If the process is isothermical the U doesn't change:

The work:

If it is an ideal gas:

Solving:

Replacing:

Given that it's a compression: V2<V1 and ln(V2/V1)<0. So:

b) The entropy change of the sistem will be equal to the calculated in a), but the change of entropy of the universe will be 0 in a) (reversible process) and in b) has to be positive given that it is an irreversible process.

i believe it is a.) released into

explanation:

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .