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.
1
Expert's answer
2012-05-18T08:12:37-0400
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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