Here's how to determine the number of atoms in NH₄HCO₃ (ammonium bicarbonate):

* Break down the formula:

* N = 1 nitrogen atom

* H = 5 hydrogen atoms (4 from NH₄ and 1 from HCO₃)

* C = 1 carbon atom

* O = 3 oxygen atoms

* Total atoms: 1 + 5 + 1 + 3 = 10 atoms

Therefore, there are 10 atoms in one molecule of NH₄HCO₃.