試題詳解

78. A pain relief medication indicates that every 6 g of powder contains approximately 480 mg of ibuprofen. Assuming all of the active ingredients are ibuprofen, the powder is fully dissolved in 0.5 L of isopropanol. What is the approximate concentration of ibuprofen in the resulting solution in ppm? (The density of isopropanol is 0.79 g/cm³.)
(A) 0.12 ppm
(B) 480 ppm
(C) 960 ppm
(D) 1215 ppm
(E) 1304 ppm