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A solution of sodium sulphate is made in 100 g of water of mass by mass percentage 20. Calculate the mass of sodium sulphate in this solution. |
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Answer» Solution :Suppose the mass of solute (sodium sulphate) = x g The mass of solvent (WATER) = 100 g `THEREFORE` The mass of solution = (x + 100)g `therefore` Mass percentage of solution = `("Mass of solute")/("Mass of solution")xx100` `20=x/((x+100))xx100` `20(x+100)=100X` `20X+2000=100x` 2000 = 100x - 20x 2000 = 80x `2000/80=x` 25 = x x = 25g 25 g of sodium sulphate would be ADDED in the solution. |
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