Question

Why change in entropy is positive for a spontaneous process in an isolated system?

Answer 1

Hi

This is because in a spontaneous reaction, the randomness of the system increases

Answer 2

Answer:

Explanation:

change in entropy is positive for a spontaneous process in an isolated system.

Spontaneity of the process is determined by change in entropy of the universe -

∆Suni > 0 indicates spontaneous process

∆Suni < 0 indicates non-spontaneous process

That is, increase in entropy of universe should be considered not only entropy of the system.

If entropy of the system is increased but total entropy of the universe is decreased, the process will still be non-spontaneous.

In spontaneous process, the randomness of the system increases