What is the mass of:

(b) 0.5 mole of water molecules?

 

Answer

We know that,

Number of moles of a substance = Given mass of the substance / Molar mass of the substance

 

Therefore,

Mass of the substance = Number of moles x Molar mass of the substance

                              

 

(b) 0.5 mole of water molecules

Given mass of H 2 O = m = ?

Molar Mass of H 2 O = M = 18g

Number of moles = n = 0.5 = 5/10 = 1/2

We know that,

Mass of the substance = Number of moles x Molar of the substance

 m = n x M

     = (1/2) x 18

     =  18/2

     = 9g

  1. Class 9
  2. Chapter 3 Class 9 - Atoms And Molecules

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo