Answer:
20 atoms
Step-by-step explanation:
The number of atoms in 2HClO3 can be determined by adding up the number of atoms of each element in the molecule and multiplying by the number of molecules.
In 2HClO3, there are:
-2 hydrogen atoms
-2 chlorine atoms
-6 oxygen atoms (2 from each HClO3 molecule)
Multiplying these numbers by the number of molecules (2) gives:
-2 x 2 = 4 hydrogen atoms
-2 x 2 = 4 chlorine atoms
-2 x 6 = 12 oxygen atoms
Therefore, there are a total of 4 + 4 + 12 = 20 atoms in 2HClO3.