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It never hurts to draw a Lewis structure to make sure you know exactly which bonds are being broken and which are being formed. For simple molecules, however, you can usually visualize the structure without having to draw the structure on paper.
It also provides context on why we add and subtract bond enthalpies to calculate the overall change in enthalpy. When we draw Lewis structure, we show that we know that it's because of the bonds breaking and forming that we get changes in enthalpy.
It is useful to draw out the lewis structures when attempting to visualize the forming and breaking of bonds in the products or reactants. It's not necessary, but it does give you some peace of mind to justify reasoning.
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