Question

The molecular formula of ammonium phosphate is

• A. ${NH}_4{\left({PO}_4\right)}_3$
• B. ${NH}_4{PO}_3$
• C. ${NH}_4{\left({PO}_3\right)}_4$
• D. ${\left({NH}_4\right)}_3{PO}_4$

Answer 1

The correct option is D

${\left({\mathrm{NH}}_4\right)}_3{\mathrm{PO}}_4$

• Atoms of the same or different elements combine to form molecules.
• The symbolic representation of a molecule is known as formula or molecular formula.
• The symbolic representation of ammonium ion is ${\mathrm{NH}}_4^{+}$ and that of phosphate ion is ${\mathrm{PO}}_4^{3-}$.
• Using the criss-cross method -

$$\begin{gathered} {\mathrm{NH}}_4{\mathrm{PO}}_4 \\ +1-3 \end{gathered}$$

• The molecular formula of Ammonium phosphate is ${\left({\mathrm{NH}}_4\right)}_3{\mathrm{PO}}_4$.