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Punjab Medical Punjab - MET Solved Paper-2001

  • question_answer
    Oxygen contains \[90%\,\,{{O}^{16}}\] and\[10%\]\[{{O}^{18}}\]. Its atomic mass is

    A) \[16.2\]                               

    B) \[17.4\]

    C) \[17\]                                   

    D) \[16.5\]

    Correct Answer: A

    Solution :

    Oxygen have \[90%\,\,{{O}^{16}}\] and\[10%\,\,{{O}^{18}}\] \[\therefore \]Atomic mass                 \[=\left[ \frac{90}{100}\times 16+\frac{10}{100}\times 16 \right]\]                 \[=\frac{1440+180}{100}=\frac{1620}{100}=16.2\]


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