Apply the conservation of mass principle to various systems including steady- and unsteadyflow control volumes.

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A piston/cylinder arrangement contains 2 kg of ammonia at a temperature 132.45 ℃ and a pressure 5 MPa. The piston floats. Heat is added to the system until the temperature of ammonia reaches 416.37 ℃. Is this process reversible in principle? Just answer with one or two sentences, without doing any computations. Determine the change of entropy for ammonia during the process. Use both the tables and correlations. Do you expect a positive or a negative change in entropy? Please, explain [one sentence is enough].