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

  • question_answer
    Calculate the weight of \[0.885\] moles of\[Mg{{(N{{O}_{3}})}_{2}}\].

    A) \[13.1\,\,g\]       

    B)        \[131\,\,g\]  

    C) \[130\,\,g\]        

    D)        \[88.5\,\,g\]

    Correct Answer: B

    Solution :

     Gram molecular weight of magnesium nitrate\[=24+2(14+3\times 16)=148\,\,g\] Weight of\[Mg{{(N{{O}_{3}})}_{2}}\]\[=\]number of moles \[\times \] gram molecular weight\[=0.855\times 148=131\,\,g\]


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