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Answer to Question #9604 in Inorganic Chemistry for Lorenzo

Question #9604
I wish to know how to calculate the Enthalpy change for the reaction POCL3.

Thank you.
Expert's answer
You must Use Hess's Law to determine the enthalpy change for the following reaction
P4O10(s) --> P4(s)+ 5O2(g) delta H = +2967 KJ {#2 reversed}
6PCl5 --> 6PCl3 + 6Cl2 delta H = +504 kJ {#3 reversed and multiplied by 6}
P4 + 6Cl2 --> 4PCl3 delta H = -1226 kJ {#1 used as is}
10PCl3 + 5O2 ---> 10POCl3 delta H = -2860 kJ {#4 multiplied by 10}
______________________________________ {added together}

P4O10 + 6PCl5 --> 10PCl3 delta H = -615 kJ

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