# HW3 - Problem Set 3 Due by Oct 16 in class Problem 1 Two...

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Problem Set 3: Due by Oct. 16 in class Problem 1. Two blocks of the same metal and same size are at different temperatures T 1 and T 2 . Each block’s heat capacity at a constant pressure is C P . These blocks are brought together and allowed to come to the same temperature. It is done at a constant pressure and it is assumed that C P is temperature-independent. Assume that the entire blocks are thermally isolated from the surrounding. (a) Express the entropy change of the two blocks (block 1 + block 2) with C P , T 1 and T 2 . (b) Is this change spontaneous? Assume that these two blocks are isolated from the surrounding. Problem 2. Calculate the entropy change when one mole of ice at 268K is melted to form water at 323K. The pressure is constant at 1 atm. The heat capacity ( C P ) of ice and water are 3.8J/K/mol and 75.3 J/K/mol, respectively. Assume that the heat capacities of ice and water are independent of temperature. The enthalpy of melting of ice at 273.15K is 6.02 kJ/mol. Problem 3. (a) What is the maximum work that can be obtained from 1000 J of heat supplied to a steam engine with a high temperature reservoir at 100 C if the radiator is at 20

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HW3 - Problem Set 3 Due by Oct 16 in class Problem 1 Two...

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