Answer
See answer below.
Work Step by Step
The reaction is endothermic because the enthalpy change of reaction is positive.
$10.0\ g\div 56.08\ g/mol=0.178\ mol\ CaO$
Enthalpy change:
$+464.8\ kJ/mol\times 0.178\ mol=82.7\ kJ$
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 217a: 34
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