Question

How many molecules are there in 36 g of H2O​

Answer 1

Given:-

→Mass of H₂O (water) = 36g

To find:-

→Number of molecules present in

36g of H₂O

Solution:-

Molar mass of H₂O:-

= 1(2)+16

= 18g

Firstly, let's calculalte the number of moles present in 36g of H₂O.

No of moles = Given mass/Molar mass

= 36/18

= 2 moles

Now, let's calculate the number of molecules.

•Avogadro number = 6.022×10²³

Number of molecules:-

= No of moles×Avogadro number

= 2×6.022×10²³

= 12.044×10²³

= 1.2044×10²⁴ molecules

Thus, 1.2044×10²⁴ molecules are there in 36g of H₂O