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Class 9
Chapter 2 Class 9 - Is Matter Around Us Pure



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Ex 2.1 A Solution contains 40g of common salt in 320g water calculate the concentration in terms of mass by mass percentage of the solution Mass of salute (Salt) = 40g Mass of Solvent Water = 320 g We know Mass & Solvent Water = 320 g we know Mass of solution = Mass of Solute + Mass of Solvent = 40g + 320g = 360 g Mass Percentage of Solution = mass of solute / mass of solution * 100 = 40/360*100 Mass Percentage of Solution = (𝑴𝒂𝒔𝒔 𝒐𝒇 𝑺𝒐𝒍𝒖𝒕𝒆)/(𝑴𝒂𝒔𝒔 𝒐𝒇 π‘Ίπ’π’π’–π’•π’Šπ’π’ )Γ—100 = πŸ’πŸŽ/(πŸ‘πŸ”πŸŽ )Γ—100 = 11.1%

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo