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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
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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