P3B.7 A block of copper of mass 500 g and initially at 293K is in thermal contact with an electric heater of resistance 1.00 kΩ and negligible mass. A current of 1.00A is passed for 15.0 s. Calculate the change in entropy of the copper, taking Cp,m = 24.4 JK−1 mol−1
P3B.7 A block of copper of mass 500 g and initially at 293K is in thermal
contact with an electric heater of resistance 1.00 kΩ and negligible mass. A
current of 1.00A is passed for 15.0 s. Calculate the change in entropy of the
copper, taking Cp,m = 24.4 JK−1
mol−1
. The experiment is then repeated with the
copper immersed in a stream of water that maintains the temperature of the
copper block at 293K. Calculate the change in entropy of the copper and the
water in this case.
P3B.8 A block of copper (Cp,m = 24.44 JK−1
mol−1
) of mass 2.00 kg and at
0 °C is introduced into an insulated container in which there is 1.00mol
H2O(g) at 100 °C and 1.00 atm. Assuming that all the vapour is condensed to
liquid water, determine: (a) the final temperature of the system; (b) the heat
transferred to the copper block; and (c) the entropy change of the water, the
copper block, and the total system. The data needed are given in Exercise
E3B.7a.
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