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NO has a double bond while in NO2 the bonds are equivalent due to resonance. The lewis structures for NO and for NO2 show that the bond order in NO is the double bond and that in NO2 it is about the average of a N-O and N=O.
Entropies of large, complicated molecules are greater than those of smaller, simpler molecules because large, complicated molecules have more disorder as there are a greater number of ways they can move around in 3D space.
Reaction enthalpy describes the total net change in enthalpy that occurs after the reactants change and form products. Standard formation enthalpies describe the enthalpy required to create a given molecule from its atoms
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