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

Required:
Calculate the standard enthalpy of formation (ΔH∘f) for nitroglycerin.

Explanation:

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For the given reaction, the standard enthalpy of reaction is:

As long as the both nitrogen's and oxygen's standard enthalpies of formation are 0, thus, by looking for water's and carbon dioxide's standard enthalpies of formation, we compute the standard enthalpy of formation for nitroglycerin as shown below:

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the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .