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 217h: 103


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Work Step by Step

$CaO(s)+SO_3(g)\rightarrow CaSO_4(s)$ Since the heat of the reaction above is given, to determine the heat of formation of calcium sulfate the heat of formation of its reactants, calcium oxide and sulfur trioxide, are required. From appendix L: $CaO(s): -635.09, $ $SO_3(g)-395.77 (kJ/mol)$ Hence: $-402.7=\Delta_f H_{CaSO_4}--395.77--635.09$ $\Delta_f H_{CaSO_4}=-1433.56\ kJ/mol$
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