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Question

A solution contains sugar dissolved in 150 g of water. If mass of the solution is 200 g, calculate the concentration in terms of mass by mass percentage of the solution.

A
10%
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B
25%
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C
50%
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D
75%
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Solution

The correct option is B 25%
Given:
Mass of solution =200 g
Mass of solvent (water) =150 g
To find: Concentration in terms of mass by mass.
Mass of solution = Mass of solute (sugar) + Mass of solvent (water)
Therefore,
Mass of solute (sugar) = Mass of solution - Mass of solvent (water)
Hence, Mass of solute =200 g150 g
Mass of solute =50 g
We know that, Concentration (mass by mass percentage) of solution =Mass of soluteMass of solution×100=50200×100
=25%

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