Answer
See answer below.
Work Step by Step
From the conservation of energy principle:
$500.\ mL\times 1\ g/mL\times 4.184\ J/g.K \times (20.0-0.0)\ K=333\ J/g\times m$
$m=125.6\ g$ melted
Remaining:
$3\times 45-125.6=9.35\ g$
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 5 Principles of Chemical Reactivity: Energy and Chemical Reactions - Study Questions - Page 217e: 78
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