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 645: 36

Answer

a) $Q_p=17KJ$ b) $Q_v=10KJ$

Work Step by Step

(a) We can find the required heat at constant pressure as follows: $Q_p=\frac{5}{2}nR(T_f-T_i)$ $Q_p=\frac{5}{2}nR(2T_i-T_i)=\frac{5}{2}nRT_i$ We plug in the known values to obtain: $Q_p=\frac{5}{2}(2.5)(8.31)(325)$ $Q_p=17KJ$ (b) We can find the required heat at constant volume as $Q_v=\frac{3}{2}nRT_i$ We plug in the known values to obtain: $Q_v=\frac{3}{2}(2.5)(8.31)(325)$ $Q_v=10KJ$
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