Ammonium phosphate is a fertiliser containing nitrogen and phosphorus. Complete the sentence choosing from the options below:

hydrochloric acid** \quad \quad nitric acid \quad \quad **phosphoric acid

Ammonium phosphate is produced by reacting ammonia with _________________

Ammonium phosphate fertiliser is sold in $35kg$ drums.

A commercial greenhouse manager treats a growing area of $14,000m^2$ using $18$ drums of ammonium phosphate.

Calculate the mass of ammonium phosphate fertiliser spread per $m^2$ of growing area.

The chemical formula for ammonium phosphate is $({NH}_4{)}_3{PO}_4$.

How many atoms of hydrogen ($H$) are in one formula unit of $({NH}_4{)}_3{PO}_4$?