To make a saturated solution, 15 g of sodium chloride is dissolved in 85 g of water at 293 K. Calculate the concentration in terms of mass by mass percentage at this temperature.

15%

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24%

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20%

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21%

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Solution

The correct option is A 15%
Mass of the solute (sodium chloride) = 15 g
Mass of the solvent (water) = 85 g
Mass of the solution = Mass of the solute + Mass of the solvent
= 15 + 85 = 100 g
Concentration (mass by mass percentage) = $\frac{mass of solute}{mass of solution} \times 100$
= $\frac{15}{100} \times 100$ = 15%

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To make a saturated solution, 15 g of sodium chloride is dissolved in 85 g of water at 293 K. Calculate the concentration in terms of mass by mass percentage at this temperature.

The correct option is A 15%Mass of the solute (sodium chloride) = 15 g Mass of the solvent (water) = 85 g Mass of the solution = Mass of the solute + Mass of the solvent = 15 + 85 = 100 g Concentration (mass by mass percentage) = mass of solutemass of solution×100 = 15 100×100 = 15%