A solution contains 30 g of salt mixed in 90 g of water. What is the concentration of the solution in terms of mass by mass percentage?

25%

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50%

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33.33%

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75%

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Solution

The correct option is A 25%
Mass by mass percentage for the concentration of a solution is given by:
$\frac{Mass of solute}{Mass of solution} \times 100$
$\Rightarrow \frac{M a s s o f s o l u t e}{Mass of solute + Mass of solvent} \times 100$
$\Rightarrow \frac{30 g}{30 g + 90 g} \times 100$
$\Rightarrow \frac{30 g}{120 g} \times 100$
$\Rightarrow \frac{1}{4} \times 100$
$\Rightarrow 25%$

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A solution contains 30 g of salt mixed in 90 g of water. What is the concentration of the solution in terms of mass by mass percentage?

The correct option is A 25%Mass by mass percentage for the concentration of a solution is given by: Mass of soluteMass of solution×100 ⇒MassofsoluteMass of solute + Mass of solvent×100 ⇒30 g30 g+90 g×100 ⇒30 g120 g×100 ⇒14×100 ⇒25%