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If 20g of salt is present is 220 g of solution, calculate the concentration of a solution:
$concentration= \frac {mass\ of\ solute}{mass\ of\ solution}×100$
Mass of solute = 20 g
Mass of solute + solvent = 220g
Concentration of solution = $\frac {20}{220}×100$
Hence, the concentration is 9.09%
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