Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 12 The Solid State - Study Questions - Page 467b: 31


1.97 kJ (lost by the system in fusion and gained on melting).

Work Step by Step

From the definition of heat of fusion: $\Delta H=m.h_f=15.5\ g\times 9.95\ kJ/mol\div 78.11\ g/mol=1.97\ kJ$ This heat must be removed from the system for fusion to happen and added for melting to happen.
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