What is the mass of:

(a) 0.2 mole of oxygen atoms?

 

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

                              

(a) 0.2 mole of oxygen atoms

Given mass of O = m = ?

Molar Mass of O = M = 16g

Number of moles = n = 0.2 = 2/10

We know that,

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

 m = n x M

     = (2 /10) x 16

     = 32 /10

     = 3.2g

 

  1. Class 9
  2. Chapter 3 Class 9 - Atoms And Molecules (Term 2)

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