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9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    What is the mass of one molecule of oxygen?

    A) \[5.31\times {{10}^{-23}}g\]      

    B)        \[5.33\times {{10}^{23}}g\]

    C) \[5.25\times {{10}^{23}}g\]     

    D)        \[5.02\times {{10}^{-23}}g\]

    Correct Answer: A

    Solution :

     Mass of\[1\]molecule of oxygen\[\frac{\text{GMW}}{\text{Avogadro }\!\!'\!\!\text{ s}\,\,\text{Number}}=\frac{32\,\,g}{6.023\times {{10}^{23}}}\]\[=5.31\times {{10}^{-23}}g\]


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