Question -
Answer -
symptoms in narcotic users. Dose of nalorphene generally given is 1.5 mg.
Calculate the mass of 1.5 × 10_−3m aqueous solution required for the above dose.
Answer
The molar mass of nalorphene 
is given as:
In 1.5 × 10−3m aqueoussolution of nalorphene,
1kg (1000 g) of water contains 1.5 × 10−3 mol
Therefore, total mass of the solution 
This implies that the massof the solution containing 0.4665 g of nalorphene is 1000.4665 g.
Therefore, mass of the solutioncontaining 1.5 mg of nalorphene is:
Hence, the mass of aqueoussolution required is 3.22 g.