Look at the image shown
: f
what does this image represent?
linear molecule with one domain
linear molecule with two domains
tetrahedral molecule with four domains
trigonal planar molecule with three domains

Explanation:

It is known that an electron pair represents a domain. Hybridization of will be calculated as follows.

       Hybridization =

Valence electrons of boron are 3 and no. of bonded atoms in a molecule is 3.

Therefore, calculate hybridization of as follows.

          Hybridization =

                              =

                               = 3

Hence, hybridization of is , that is, trigonal planar.

Thus, we can conclude that the given image represents that it is a trigonal planar molecule with three domains.        

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products