Simple method for writing Lewis Structures for N2O4 | Chemistry Net

Simple method for writing Lewis Structures for N2O4

Simple method for writing Lewis Structures for N2O4

Simple Method for writing Dot Structures of N2O4

A simple procedure for writing Lewis structures is given in a previous article entitled “Lewis Structures and the Octet Rule”. Several worked examples relevant to this procedure were given in previous posts please see the Sitemap - Table of Contents (Lewis Electron Dot Structures).

Another example  for writing Lewis structures following the above procedure is given below.

Let us consider the case of the dot structures of dinitrogen tetroxide (N2O4). Dinitrogen tetroxide is a powerful oxidizer that upon conduct spontaneously reacts with hydrazine making the pair a popular fuel for rockets.

How can we construct the N2O4 Lewis structure?

 

Step 1: Connect the atoms with single bonds. The central atoms are the nitrogen atoms.



Step 2:

Calculate the # of electrons in π bonds (multiple bonds) using formula (1):

Where n in this case is 6 since N2O4 consists of six atoms.

Where V = (6 + 5 + 5 + 6 + 6 + 6 ) = 34, where V the number of the valence electrons of  N2O4

Therefore, P = 6n + 2 – V = 6 * 6 + 2 – 34 = 4    There are 4π electrons in N2O4 and that means 2 double bonds or a triple bond must be added to the structure in Step 1.

However, all the atoms present are second row elements and cannot accommodate more than 8 valence electrons. Therefore, a triple bond cannot be used as it would place ten electrons around the atoms bonded. The only possible case is that of two double bonds.

 

Step 3 & 4: The Lewis structures of N2O4 are as follows:

Lewis electron dot structures for N2O4


Figure 1: Lewis electron dot structures for N2O4




 

Relevant Posts

Lewis Structures|Octet Rule: A Simple Method to write Lewis Structures

Simple method for writing Lewis Structures for N2O3

Simple method for writing Lewis Structures for N2O2

 


 

References

  1. G.N. Lewis, J.A.C.S, 38, 762-785, (1916)
  2. E. C. McGoran, J. Chem. Educ., 68, 19-23 (1991)
  3. A.B.P. Lever, J. Chem. Educ., 49, 819-821, (1972)

 

Key Terms

resonance structures of nitrous oxide n2o4, Lewis electron structures of dinitrogen tetroxide, chemical formula of n2o4, simple procedure for drawing Lewis structures of dinitrogen tetroxide,

 


1 comment:

  1. Thank you. This is the best explanation on the web :)

    ReplyDelete