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Manipal Medical Manipal Medical Solved Paper-2015

  • question_answer
    Nalorphene   (\[{{C}_{19}}{{H}_{21}}N{{O}_{3}}\])   similar   to morphine, is used to combat withdrawal symptoms in narcotic uses. Dose of nalorphene generally given is 1.5 mg. The mass \[1.5\times {{10}^{-3}}m\] aqueous solution required for the above dose is

    A) 5.2g                                          

    B) 3.2 g  

    C) 4.6 g                                         

    D) 1.9g

    Correct Answer: B

    Solution :

    \[{{w}_{B}}=1.5\times {{10}^{-3}}g\] \[{{m}_{B}}=19\times 12+21\times 1+14+3\times 16=311\]             \[m=\frac{{{w}_{B}}/{{m}_{B}}}{{{M}_{A}}}\times 1000\] \[1.5\times {{10}^{-3}}=\frac{1.5\times {{10}^{-3}}/311}{{{M}_{A}}}\times 1000\]           \[{{m}_{A}}=\frac{1.5\times {{10}^{-3}}}{311\times 1.5\times {{10}^{-3}}}\times 1000\]                  \[=\frac{1000}{311}=3.2g\]


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