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  • Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

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Solution:
Mass Percent: amount of solute in 100 gram of solution.
Mass Percent (%) =\frac{massofsolute\times100}{massofSolution}
Let the mass of sodium sulphate required be = m gram
Mass of the solvent (water) = 100 gram
The mass of solution = (m + 100) gram (sum of mass of solute and solvent)
20=\frac{m\times100}{m+100}
\Rightarrow 20m+2000=100m
\Rightarrow 2000=80m
\Rightarrow m=25g

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