# Answer on Inorganic Chemistry Question for Lorenzo

Question #9604

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

Thank you.

Thank you.

Expert's answer

You must Use Hess's Law to determine the enthalpy change for the following reaction

P

6PCl

P

10PCl

______________________________________ {added together}

P

P

_{4}O_{10}(s) --> P_{4}(s)+ 5O_{2}(g) delta H = +2967 KJ {#2 reversed}6PCl

_{5}--> 6PCl_{3}+ 6Cl_{2}delta H = +504 kJ {#3 reversed and multiplied by 6}P

_{4}+ 6Cl_{2}--> 4PCl_{3}delta H = -1226 kJ {#1 used as is}10PCl

_{3}+ 5O_{2}---> 10POCl_{3}delta H = -2860 kJ {#4 multiplied by 10}______________________________________ {added together}

P

_{4}O_{10}+ 6PCl_{5}--> 10PCl_{3}delta H = -615 kJNeed a fast expert's response?

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