Using the concept of Hess’ law, manipulate the equations and their D H values

Question

Using the concept of Hess’ law, manipulate the equations and their DH values (without using any numbers!) to demonstrate how you would calculate the DHrxn for the following chemical reaction. Again, only use the given information below:

N2 + 4H2 + 2O2 + 1/8S8 → (NH4)2SO4 DH = ?

When given the following information:

2NH4NO3 + H2SO4 → (NH4)2SO4 + 2HNO3 DH1

NH3 → 3/2H2 + ½ N2 DH2

NH3 + HNO3 → NH4NO3 DH3

H2SO4 → SO3 + H2O DH4

2SO2 + O2 → 2SO3 DH5

S8 + 8O2 → 8SO2 DH6

2H2O → 2H2 + O2 DH7

Explanation / Answer

DH=DH1-2DH2+2DH3-DH4+0.5DH5+(1/8)DH6-0.5DH7

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