Non-cyclic processs The diagram at right shows a cylinder filled with an ideal g

Question

Non-cyclic processs The diagram at right shows a cylinder filled with an ideal gas sitting on a reservoir at 400 K. The cylinder is fitted with a piston that is free to move without friction when its path is not blocked by a pin. The lower pin is removed allowing the gas to expand rapidly. During this process, 600 J of heat are transferred from the reservoir to the gas. What can be said about the change in internal energy of the gas? What can be said about the change in entropy of the gas. Systems that cannot exchange energy in the form of heat or mechanical work with their surroundings are said to be isolated. What can be said about the change in interial energy of an isolated system? What can be said about the change in entropy of an isolated system?

Explanation / Answer

A) change in internal energy can be positive or negative depending on the expansion

change in entropy is positive

B) change in internal energy = 0

change in entropy = 0

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