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

  • question_answer
    Calculate the number of atoms present in \[6.4\,\,g\] of sulphur.

    A)  \[2.4\times {{10}^{-23}}\]atoms

    B)  \[2.4\times {{10}^{-23}}\]atoms

    C)  \[1.2\times {{10}^{23}}\]atoms  

    D)  \[1.2\times {{10}^{-23}}\]atoms

    Correct Answer: C

    Solution :

     Atomic weight of\[S=32.06\,\,a.m.u\]\[1\]gram atomic weight of \[S=32.06\,\,g=\]\[6.023\times {{10}^{23}}\]atoms of sulphur. Number of atoms in\[6.4\,\,g\]of\[S\]\[=\frac{6.4}{32.06}\times 6.023\times {{10}^{23}}=1.2\times {{10}^{23}}\]atoms


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