0.5 g of a substance is dissolved in 25 g of a solvent. Calculate the amount of the substance in % w / w in the solution.A. 5.34 %B. 2.00 %C. 1.96 %D. 2.92 %
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Solution
The correct option is C 1.96 %
Given: mass of substance = 0.5 g
Mass of solvent = 25 g
%ww=weight of the component in solution (g)total weight of the solution
(g)×100
%ww=0.50.5+25×100=1.96%
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Text Solution
Solution : Mass of solute (common salt) = 0.5 g <br> Mass of solvent (water) = 25 g <br> Mass of solution = (0.5 + 25)g = 25.5 g <br> Now, Mass percentage of solution <br> = `("Mass of solute")/("Mass of solution")xx100` <br> = `0.5/25.5xx100` <br> = 1.96%
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