Find the concentration of solution in terms of weight percent if $20 g$ of common salt is dissolved in $50 g$ of water.

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Solution

Solute $= 20 g$
Solvent $= 50 g$
Solution $= 20 + 50 = 70 g$
Concentration of solution $= \frac{20}{70} \times 100 = 28.57 %$

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