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Solution: Given the following data:Calculate ΔH for the reaction On the basis of the enthalpy change, is this a useful reaction for the synthesis of ammonia?
Problem
Given the following data:
Calculate ΔH for the reaction 
On the basis of the enthalpy change, is this a useful reaction for the synthesis of ammonia?
Solution
We start solving this by setting up the equations according to the structures drawn
(1) 2NH3 (g) → N2 (g) + 3H2 (g) ΔH°rxn = 92 kJ
(2) 2H2 (g) + O2 (g) → 2H2O (l) ΔH°rxn = -484 kJ
To find the ΔHrxn of the third reaction, we need to use the Hess's Law where we have to rearrange the given equations to get the desired reaction.
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Hess's Law