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 217c: 52


$-319.7\ kJ/mol$

Work Step by Step

Manipulating the given reactions: $\begin{smallmatrix} 1/4\ P_4(s)+5/2\ Cl_2(g)&\rightarrow&PCl_5(s)&-443.5\ kJ/mol\\ PCl_5(s)&\rightarrow&PCl_3(s)+Cl_2(g)&+123.8\ kJ/mol\\ \hline\\ 1/4\ P_4(s)+3/2\ Cl_2(g)&\rightarrow&PCl_3(s)&-319.7\ kJ/mol \end{smallmatrix}$
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