Chemistry Practice Problems Hess's Law Practice Problems Solution: Given the following data:Calculate ΔH for the reac...

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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) + 3H(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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