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A solution is prepared by dissolving 25 g of sugar in 100 g of water. What is the mass percentage of the solute?
A20%
B25%
C75%
D80%
Answer & Solution
Correct answer: A. 20%
1. Mass percentage = mass of solute / mass of solution x 100, where solution mass = solute + solvent.
2. Mass of solution = 25 + 100 = 125 g.
3. Mass percentage = (25 / 125) x 100 = 20%.
4. The trap value 25% comes from wrongly dividing by the solvent (100 g) instead of the total solution.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 9 Solutions "Mass percentage", p.139_
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