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Calculate the standard enthalpy of formation (ΔH?f) for nitroglycerin

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Calculate the standard enthalpy of formation (ΔH?f) for nitroglycerin.

The explosive nitroglycerin (C3H5N3O9) decomposes rapidly upon ignition or sudden impact according to the following balanced equation:
4C3H5N3O9(l)→12CO2(g)+10H2O(g)+6N2(g)+O2(g)ΔH?rxn=−5678kJ