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Nalophene (C_(19)H_(21)NO_(3)), similar to morphine, is used to combat withdrawal symptoms in narcotic users. Dose of nalorphene generally given is 1.5 mg. Calculate the mass of 1.5xx10^(-3) m aqueous solution required for the above dose. |
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Answer» Solution :The molar MASS of nalorphene `C_(19)H_(21)NO_(3)` is given as : `19xx12+21xx1+1xx14+3xx16` = 311 g `mol^(-1)` In `1.5xx10^(-3)`m aqueous solution of nalorphene, 1 kg (1000 g) of water CONTAINS `= 1.5xx10^(-3)` mol of nalorphene i.e., `= 1.5xx10^(-3)` = 311 g = 0.4665 g of nalorphene Therefore, TOTAL mass of the solution `= (1000+0.4665)g` = 1000.4665 g This implies that the mass of the solution containing 0.4665 g of nalorphene is 1000.4665 g. Therefore, mass of the solution containing 1.5 mg of nalorphene is : `= (1000.4665xx1.5xx10^(-3))/(0.4665)` = 3.22 g Hence, the mass of aqueous solution required is 3.22 g. |
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