Question

Nalorphene `(C_(19)H_(22)NO_(3))`, similar to morphine , is used to combat withdrawal symptoms in narcotic users. The dose of nalorphene generally given is `1.5 mg`. Calculate the mass of solution of `1.5xx10^(-3)m` aqueous solution required for the above dose.

Answer 1

Correct Answer - `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` .