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Nalorphene (C(19)H(21)ONO(3)), similar t...

Nalorphene `(C_(19)H_(21)O_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 `1.5-10^(-3)m` aqueous solution required for the above dose.

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The correct Answer is:
`W_(solution)=3.2015g`
Molecular mass of Nalorphene`(C_(19)H_(22)NO_(3))`
`=19xx12+1xx22+14+3xx16`
`=312g mol^(-1)`
`m=(W_(2)xx1000)/(Mw_(2)xxW_(1))`
`1.5xx10^(-3)(1.5xx10^(-3)gxx10000)/(312xxW_(1))`
`W_(1)=(1.5)/(3.12xx1.5xx10^(-3))=(10^(3))/(312)=3.2g`
Weight of `H_(2)O=3.2g`
Weight of solution `=3.2+1.5xx10^(-3)`
`=3.2 +0.0015=3.2015g` .
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