How many equivalent Lewis structures are necessary to describe the bonding in H2O?

Answer 1

A Lewis structure is a diagram showing the chemical components of a substance. Only one is required to show how CO2 bonds. CO2 contains 2 double bonded oxygen atoms 180o apart.

Answer 2

One Lewis structure is sufficient to describe a water molecule.

Answer 3

2

Answer 4

A single Lewis structure can be used to represent the bonding in CH4.

There are 2 equivalent Lewis structures for nitryl chloride where the double bond to oxygen can be placed on either of the terminal oxygen atoms. These oxygens are actually equivalent in NO2Cl and we can think of the double bond as spread out over both of the O's.