To heat 1 cup of water (250 cm3 ) to make coffee, you place an electric heating element in the cup. As the water temperature increases from 17.0˚C to 65.0˚C, the temperature of the heating element remains at a constant 110˚C.   A) Calculate the change in entropy of the heating element. Treat the heating element as a heat reservoir.   ΔS =  _______J/K   B)Calculate the change in entropy of the heating element. Treat the heating element as a heat reservoir.   ΔS =  _______J/K   C) What is the change in entropy of the system of water and heating element?   ΔS =  _______J/K   D) Explain why is the process irriversible ?

Physics for Scientists and Engineers
10th Edition
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
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Chapter21: Heat Engines, Entropy, And The Second Law Of Thermodynamics
Section: Chapter Questions
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To heat 1 cup of water (250 cm3 ) to make coffee, you place an electric heating element in the cup. As the water temperature increases from 17.0˚C to 65.0˚C, the temperature of the heating element remains at a constant 110˚C.

 

A) Calculate the change in entropy of the heating element. Treat the heating element as a heat reservoir.
 
ΔS =  _______J/K
 
B)Calculate the change in entropy of the heating element. Treat the heating element as a heat reservoir.
 
ΔS =  _______J/K
 
C) What is the change in entropy of the system of water and heating element?
 
ΔS =  _______J/K
 
D) Explain why is the process irriversible ?
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