What volume of distilled water must be diluted with 100 g of 9% sodium chloride solution to obtain 0.9% saline?

concentration = m (substance) / m (solution) * 100%
9% = m (substance) / 100 * 100% m (substance) = 9g
0.9% = 9 / (100 + x) * 100%, x is the mass of added water
0.009 = 9 / (100 + x), 0.9 + 0.009x = 9, x = 900g
Volume = m * p, where p is the density, because mass in grams, then we take the density in g / cm ^ 3. distilled water density = 1g / cm ^ 3
Volume = 900 * 1 = 900cm ^ 3
Answer: 900 ml