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12th Class Chemistry Nuclear Chemistry / नाभिकीय रसायन Question Bank Critical Thinking Nuclear chemistry

  • question_answer
    Oxygen contains 90% of \[{{O}^{16}}\] and 10% of \[{{O}^{18}}\]. Its atomic mass is                                         [KCET 1998]

    A)            17.4                                          

    B)            16.2

    C)            16.5                                          

    D)            17

    Correct Answer: B

    Solution :

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


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