A quantity of an ideal gas in an isolated system expanded isothermally and reversibly at 400 K from a volume V1 to a volume V2. During the expansion, the gas absorbs 200 J of heat from the reservoir in contact with it. If the gas expanded freely V1 to a volume V2 at 400 K and absorbed 100 J of heat, what will be: (a) the entropy change of the gas; (b) the entropy change of the reservoir, and (c) the entropy change of the whole system. Answer: (0.50, 0, 0.50)

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.