Question

How would you write 2 molecules of Oxygen and 5 molecules of Nitrogen?

Answer 1

2 molecules of oxygen → 2O₂ 

Reason : 

1.  Oxygen is diatomic element. 
2.  Two oxygen atoms combine to form one oxygen molecule. 
3.  The formula of oxygen molecule is O₂ .

5 molecules of nitrogen → 5N₂ 

Reason : 

1.  Nitrogen is also diatomic element. 
2.  Two nitrogen atoms combine to form one nitrogen molecule. 
3.  Molecular formula of nitrogen is N₂.