College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 108

An isolated system consists of two very large thermal reservoirs at constant temperatures of 100 °C and 0 °C. Assume the reservoirs made contact and 1000 J of heat flew from the cold reservoir to the hot reservoir spontaneously. (a) The total change in entropy of the isolated system (both reservoirs) would be (1) positive, (2) zero, (3) negative. Explain. (b) Calculate the total change in entropy of this isolated system.