Question

A solution contains 20 gm of common salt in 280 gm of water calculated the concentration in terms of mass by percentage of solution

Answer 1

Here's your answer !!

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Mass of Solute =20gram

Mass of Solvent =280 gram

So,

Mass of Solution =Mass of Solute +Solvent
$= > 20 + 280 \\ = > 300gram$
Now,

Concentration of solution =
$= > \frac{solute}{solution} \times 100 \\ = > \frac{20}{300} \times 100 \\ = > 6.67(approx)$
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Hope it helps you !! :)

Answer 2

Mass of NaCl = 20 gm

Mass of H20 = 280 gm

Mass of the solution = 300 gm

Mass % = Mass of NaCl / Mass of solution * 100%

Mass % = 20/300 * 100%

Mass % = 6.67%

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