We are asked to use bond energies to calculate ΔHrxn for the reaction: N2(g) + 3 H2(g) → 2 NH3(g).
To calculate the ΔH°rxn using bond energies, we’re going to use the following equation:
Let’s first figure out what kind of bonds and how many moles are present in each reactants and products by drawing the Lewis structure because the given bond energies are per mole.
Balanced Reaction: N2(g) + 3 H2(g)→ 3 H2(g) + 2 NH3(g)
*always make sure that the given reaction is balanced
Therefore, we need to do the following first:
Step 1: Determine the central atom in this molecule.
Step 2: Calculate the total number of valence electrons present.
Step 3: Draw the Lewis structure for the molecule.
Use bond energies to calculate ΔHrxn for the reaction: N2(g) + 3H2(g) → 2NH3(g)
Average Bond Energies
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