In the table given below, write the number of molecules and the total number of atoms. Substance Number of molecules Total number of atoms O 2 2 N 2 6 Cl 2 2 He 5 Na O 3 P 4

O 2 is an oxygen molecule which is diatomic and consists of 2 atoms. Oxygen can't be found in its free form in the nature. Substance Number of molecules Total number of atoms O 2 1 2 2 N 2 is two molecules of nitrogen gas, which is a diatomic molecule. So the total number of atoms is 2 × 2 = 4 . Substance Number of molecules Total number of atoms 2 N 2 2 4 6 Cl 2 is 6 molecules of chlorine gas, which is a diatomic molecule. So the total number of atoms is 6 × 2 = 12 . Substance Number of molecules Total number of atoms 6 Cl 2 6 12 2 He contains 2 helium molecules. Helium is a mono atomic molecule. So the total number of atoms is 2 . Substance Number of molecules Total number of atoms 2 He 2 2 5 Na contains 5 sodium molecules. Sodium is a monatomic molecule. So the total number of atoms is 5 . Substance Number of molecules Total number of atoms 5 Na 5 5 O 3 is an ozone molecule. It is a polyatomic (triatomic) molecule. So the total number of atoms is 3 . Substance Number of molecules Total number of atoms O 3 1 3 P 4 is a phosphorus molecule. It is a polyatomic molecule. So the total number of atom is 4 . Substance Number of molecules Total number of atoms P 4 1 4