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The weight percentage of NaCl solution is 10. If the weight of solution is 150 gr. Calculate weight of NaCl (in grams) _________________
Correct Answer: 15
A 10% by weight solution contains 10 g of NaCl in every 100 g of solution. So 150 g of solution contains $$\frac{10}{100} \times 150 = 15\text{ g}$$ of NaCl.
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