2 g of pure solute was added to 70 g of 5% solution. Calculate
mass fraction of solute in this solution, Give the answer as a
percentage.
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We want Concentration=Mass of solute100 mL volume of solvent . We make the reasonable assumption that the volume of solution is equal to 40⋅mL . 25⋅g(40100)⋅mL=62.5⋅g⋅(100⋅mL)−1
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