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NCERT Class XII Chemistry
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Question : 29
Total: 53
Nalorphene (C19H21NO3), 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 1.5×10–3 m aqueous solution required for the above dose.
Solution:  
. Given, m=1.5×10–3
Mass of solvent = 1 kg
Molar mass of C19H21NO3 =19×12+21+14+48 =311gmol–1
∴ 1.5×10–3 mole of C19H21NO3 =1.5×10–3×311g =0.467g=467mg
∴ Mass of solution = 1000 g + 0.467 g = 1000.467 g
Thus, for 467 mg of nalorphene, solution required = 1000.467 g
For 1.5 mg of nalorphene, solution required =
1000.467
467
×15.=3.21g
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