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heats of reaction equation

markosheehan

Member
Jun 6, 2016
136
hello
I am stuck on this question
The decomposition of nitroglycerine is given by the following

2C3H5N3O9 = 6CO2 + 5H2O + 3N2 + 1/2O2

using the following heats of formation, determine the energy released in the decomposition of of nitroglycerine.

heats of formation of CO2(g), and H2O(l), C3H5N3O9 are -393, 242 and -364 kJ/mole, respectively

I am using hesses law to try and work this out
I multiply the heat of formation equation of Co2 by 6 and reverse it and multiply the heat of formation equation of H2O by 5.

I multiply the heat of formation equation of C3H5N3O9 by 2 and reverse it aswell.

when I do all of this a lot of the compounds cancel but I am left with 5/2 o2 on the left hand side of the final equation which can not be there
 

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