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A Solution is prepared by dissolving certain amount of solute in 500 g water. The % by mass of a solutions is 2.38 . Calculate mass of the solute. |
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Answer» Correct Answer - Mass of the solute =12. 19 g Given : `W_(1)`= Mass of a solvent (water) = 500 g `W_(2)` Mass of a solute =? % by mass = % `(W//W) = 2. 38` Let mass of the solute `=W_(2) =x g` `:.` Mass of the solution `= W_(1) + W_(2) = (500 + x) g` Now per cent by mass of solute `= ("mass of solute")/("mass of solution") xx 100` `= ("mass of solute")/("mass of solvent + mass of solute") xx 100` `:. 2.38 = (X )/((500 + X)) xx 100` `:. 2. 38 (500 + X) =100 x` `:. 2.38 xx 500 + 2.38 X =100 x` `:. 1190 + 2.38 X = 100 x` `:. 100 x -2.38 x= 1190` `:. (100 -2.38) x= 1190` `:. 97 .62 x = 1190` `:. x = (1190)/(96.62) =12.19` |
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