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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

What are the orders of the N—O bonds in NO2 and NO2+? The nitrogen-oxygen bond length in one of these ions is 110 pm and 124 pm in the other. Which bond length corresponds to which ion? Explain briefly.

Interpretation Introduction

Interpretation:

The orders of NO bonds in NO2 and NO2+ and the bond lengths have to be determined.

Concept Introduction:

Fractional bond order: The molecules which have resonance structures possess fractional bond order.

Bond order between any bonded pair of atoms X and Y:

Bondorder=numberofsharedpairsinallXYbondsnumberofXYlinksinthemoleculeorion

Bond length is inversely proportional to the bond order.

A higher bond order results in a shorter bond for a given pair of atoms.

Explanation

Bond order for the compounds having resonance structures can be calculated by the general equation:[If the bond pair have the atoms X and Y]

Bondorder=numberofsharedpairsinallXYbondsnumberofXYlinksinthemoleculeorion

Bond order of NO bonds in NO2is calculated as follows:

Bondorder=numberofsharedpairsinallXYbondsnumberofXYlinksinthemoleculeorion

In NO2, one NO single bond and one N=O double bond is present.

The number of shared pairs is three and there are two nitrogen-oxygen links.

Bondorder=32=1.5

Bond order of NO bonds in NO2+is calculated as follows:

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