Question

The formula of water molecule is H₂O. What information do you get from this formula?

Answer 1

• Water is a combination of hydrogen and oxygen. 
• Two hydrogen atoms and one oxygen atom combine to form one water molecule. 
• Molecular weight of water molecule is 18. [Hydrogen 1, Oxygen 16. H₂O ⇒ 2 × 1 + 16=18] 
• 18 g of water molecule contains 6.022 × 10²³ particles in it. 
• Valency of hydrogen is 1 and oxygen is 2.