Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 18 - The Laws of Thermodynamics - Problems and Conceptual Exercises - Page 648: 90

Answer

(a) decrease (b) $662J/K$ (c) increase

Work Step by Step

(a) It is given that a small dish of water is placed outside for birds and at night the temperature drops to $-5.0^{\circ}$. Thus, the heat flows out of water and as a result the entropy of the system decreases. (b) We know that $\Delta S=\frac{Q}{T}$ We plug in the known values to obtain: $\Delta S=\frac{mL_f}{T}$ We plug in the known values to obtain: $\Delta S=\frac{(0.53Kg)(33.5\times 10^4J/Kg)}{268K}$ $\Delta S=662J/K$ (c) We know that the entropy increases whenever heat is added to the system.
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