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

  • question_answer
    Calculate the weight of \[2.5\] moles of\[CaC{{O}_{3}}\].

    A) \[200\,\,g\]        

    B)        \[230\,\,g\]

    C) \[240\,\,g\]        

    D)        \[250\,\,g\]  

    Correct Answer: D

    Solution :

     Formula weight of\[CaC{{O}_{3}}\] \[=40+12+3\times 16=100\,\,a.m.u.\] \[1\] mole of\[CaC{{O}_{3}}=100\,\,g\] Hence, \[2.5\] moles of\[CaC{{O}_{3}}\] \[=2.5\times 100=250\,\,g\]


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