Final answer:
NH4NO3 contains 2 nitrogen atoms, 4 hydrogen atoms, and 3 oxygen atoms.
Step-by-step explanation:
The formula NH4NO3 represents ammonium nitrate. To determine the number of nitrogen atoms, hydrogen atoms, and oxygen atoms in NH4NO3, we need to examine the subscripts in the formula. There are two nitrogen atoms, four hydrogen atoms, and three oxygen atoms in one molecule of NH4NO3.