How many atoms in 3Na(H_(2)O)_(2) 21 27 10 14

To determine the number of atoms in the compound , we need to break down the compound into its individual atoms.The compound consists of:- 3 sodium atoms (Na)- 2 water molecules (H_{2}O) for each sodium atom- Each water molecule (H_{2}O) consists of 2 hydrogen atoms (H) and 1 oxygen atom (O)So, for each sodium atom, there are 2 water molecules, each containing 2 hydrogen atoms and 1 oxygen atom.Therefore, the total number of atoms in is:3 sodium atoms + (2 water molecules x 3 sodium atoms) x (2 hydrogen atoms + 1 oxygen atom)= 3 sodium atoms + 6 water molecules x (2 hydrogen atoms + 1 oxygen atom)= 3 sodium atoms + 6 hydrogen atoms + 3 oxygen atoms= 12 atomsSo, the correct answer is 12.