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(b) For BFCl 2 , the Lewis structure leaves B  with only six electrons around it:

Using Lewis Structures and Bond Energies to Estimate Heats of Reaction

• Can use Lewis structures and bond enthalpies to calculate heats of reaction by noting which reactant bonds break and which product bonds form.

• In practice, assume that all the reactant bonds break to give individual atoms, from which all the product bonds form.

Concept 10-5. How a reaction can be divided conceptually into bond-breaking and bond-forming steps

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