Question
A solution is prepared by dissolving 15 g of salt in 585 g of water. Calculate the mass percent (w/w) of the solution.
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RRB NTPC 2025 Under Graduate CBT 1 Question Paper PDF (20-Jun-2026) (Shift 3)
The correct answer is
2.5%
Mass percent (w/w) is given by \(\frac{\text{mass of solute}}{\text{mass of solution}} \times 100\).
Total mass of solution \(= 15 + 585 = 600\ \text{g}\).
Mass percent \(= \frac{15}{600} \times 100 = 2.5\%\).
Hence, the mass percent of the solution is \(2.5\%\).
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