Class 12 Chemistry - Chapter Solutions NCERT Solutions | Nalorphene (C19H21NO3), similar to morph
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 x 10-3m aqueous solution required for the above dose.
Molecular mass of nalorphene (C19H21NO3),
= 19 x 12 + 21 x 1 + 1 x 14 + 3 x 16 = 311 g/mol
Moles of nalorphene (C19H21NO3) = 1.5 x 10-3 x 311 = 4.67 x 10-6 mol
Now molality = (moles of solute / mass of solvent in g) x 1000
Putting the values in above equation,we get
1.5 x 10-3 = (4.67 x 10-6 / mass of water) x 1000
Or
Mass of water = (4.67 x 10-6 x 1000) / 1.5 x 10-3
Therefore mass of water = 3.1g
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