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Example2.1 A solution contains 40 g ofcommon salt in 320 g of water.Calculate the concentration in terms ofmass by mass percentage of thesolution.

Answer»

Mass of solute - NaCl =40gmMass of solvent - water =320gmMass of solution =(40+320) gm=360gmConcentration in terms of Mass by mass percentage =mass of solute /mass of solution *100=40/360*100%=11.11%

Mass of solute(salt)=40gmass of solvent(water)=320gWe know,Mass of solution =mass of solute+mass of solvent =40g+320g =360gmass percentage of solution =mass of solute÷mass of solution ×100 =40÷360×100 =11.1%



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