7. How much water should be added to 15 g of sugar to prepare a 15% sugar solution?
8. How is the concentration of any solution expressed in terms of mass-by-volume percentage?
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7. 15 by 100 because its 15 percent .
So, 15÷100×15.
It comes 3÷4×3=9÷4 = 2.25 gms
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