The change of heat capacity with temperature for solid aluminum is as follows: Cp(J/K mol) = 20.67 + 12.38 x10-3 T  (in the range of 25 -700 °C ) If 1 mol of Aluminum is heated from 25°C to 700°C, what will be the entropy change?

Thermodynamics -Chem

Example 3 : Suppose that 1 kg of saturated water vapor at 100C is condensed to a saturated liquid at 100 C in a constant-pressure process by heat transfer to the surrounding air, which is at 25C. What is the net increase in entropy of the water plus surroundings?

P2.10. A block of copper weighing 0.2 kg with an initial temperature of 400 K is dropped into 4 kg of water initially at 300 K contained in a perfectly insulated tank. The tank is also made of copper and weighs 0.5 kg. Solve for the change in internal energy of both the water and the block given CV = 4.184 J/g-K for water and 0.380 J/g-K for copper. (ANS. 7480 J, –7570 J) P2.11. In the preceding problem, suppose that the copper block is dropped into the water from a height of 50 m. Assuming no loss of water from the tank, what is the change in internal energy of the block? (ANS. –7570 J)