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JAMB Chemistry 2021 Paper

Question : 28

Total: 40

Solution:

Concept:

Mass by mass percentage compares the mass of solute to the total mass of the whole solution, expressed as a percentage.

Explanation:

Mass of solute

= 20\ \text{g}

Mass of solvent (water)

= 180\ \text{g}

Therefore, total mass of solution

= 20\ \text{g} + 180\ \text{g} = 200\ \text{g}

Use the formula:

\text{Mass percent} = \frac{\text{Mass of solute}}{\text{Mass of solution}} \times 100\%

Substitute the values:

\text{Mass percent} = \frac{20\ \text{g}}{200\ \text{g}} \times 100\%

\text{Mass percent} = \frac{20}{200} \times 100\%

\text{Mass percent} = 0.1 \times 100\% = 10\%

Answer:

The concentration of the solution is

10\%

by mass.

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