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A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage?

A. 11.1%

B. 22.2%

C. 10%

D. 20%

QUICK ANSWER…

C

DETAILS…

If a solution contains 20g of solute in 180g of solvent, and if the solvent is water, the concentration of the solution in terms of mass by mass percentage is 10%, let me explain…

Data given:

Mass of solute = 20g

Mass of solvent = 180g

But mass of solution = mass of solute + mass of solvent = 20 + 180 = 200g

Therefore,

Concentration in terms of mass percentage

= (mass of solute/mass of solution) × 100

= (20/200) × 100

= 10%

Now for the right answer to the above question:

1. Option A is incorrect. mass of the solute must be added to the mass of the solvent to obtain the mass of the solution.
2. Option B is not correct.
3. C is correct.
4. D is not the correct answer.

KEY-POINTS…

You may please note these/this:

• Mass of solution = mass of solute + mass of solvent.
• Percentage concentration (by mass) = (mass of solute/mass of solution) × 100

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/ culled from 2021 JAMB-UTME CHEMISTRY question 28 /