Question

Write the chemical formula for the covalent compounds and mention the molecular weight after the formula

Dinitrogen tetroxide

Answer 1

Covalent compound

• Covalent compounds are compounds having strong intramolecular bonds. atoms within the compound are tightly held together
• A covalent bond is formed by sharing of electron pairs between atoms. these electron pairs are known as shared pairs or bonding pairs.

Dinitrogen tetroxide

• Dinitrogen tetroxide contains 2 nitrogen and 4 oxygen atoms
• Nitrogen has a valency of +3 and oxygen has a valency of -2

$$\begin{gathered} \mathrm{N}\mathrm{O} \\ 32(\mathrm{crossmultiply}\mathrm{the}\mathrm{valencies}\mathrm{as}\mathrm{their}\mathrm{subscripts}) \\ {\mathrm{N}}_2{\mathrm{O}}_3(\mathrm{simplifying}\mathrm{the}\mathrm{ratio}\mathrm{of}\mathrm{atoms}) \\ \mathrm{Dinitrogen}\mathrm{tetroxide}:{({\mathrm{N}}_2{\mathrm{O}}_4)}^{-2} \end{gathered}$$

• The chemical formula for Dinitrogen tetroxide is ${\mathbf{\left(}{\mathbf{N}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{4}}\mathbf{\right)}}^{\mathbf{-}\mathbf{2}}$

Molecular weight

• Mass of N - 14
• Mass of O - 16
• Molecular weight of ${\left({\mathrm{N}}_2{\mathrm{O}}_4\right)}^{-2}$ = (14 x 2) + (4 x 16) = 92 g