Answer: 60 atoms
Explanation: To determine the number of atoms in 3NH4NO3, we need to first identify the number of atoms in one molecule of NH4NO3.
NH4NO3 consists of one nitrogen atom (N), four hydrogen atoms (H), and three oxygen atoms (O).
There are 2 nitrogen atoms and 6 oxygen atoms in 3 molecules of NH4NO3 because:
Each molecule of NH4NO3 has one nitrogen atom and three oxygen atoms, so three molecules have three nitrogen atoms and nine oxygen atoms in total.
However, there are two nitrogen atoms shared between the molecules, so there are only two distinct nitrogen atoms in the compound.
Next, each molecule of NH4NO3 contains four hydrogen atoms, so three molecules contain a total of 12 hydrogen atoms.
So the total number of atoms in 3NH4NO3 is:
2 nitrogen atoms x 3 + 12 hydrogen atoms x 3 + 6 oxygen atoms x 3 = 6 + 36 + 18 = 60.
Therefore, there are a total of 60 atoms in 3NH4NO3.