Chemistry and Chemical Reactivity (9th Edition)

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 217g: 95


$-68.9\ kJ/mol$

Work Step by Step

Number of moles of silver nitrate: $250.\ mL\times 0.16\ M=40\ mmol$ Number of moles of NaCl: $125.\ mL\times 0.32\ M=40\ mmol$ Both are in stoichiometric proportions. From the definition of heat capacity: $(250+125)\ mL\times 1.0\ g/mL \times 4.2\ J/g.K \times (22.90-21.15)=2756.25\ J$ With a negative sign since it's exothermic. Per mol: $-2756.25\ J/40\ mmol=-68.9\ kJ/mol$
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