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

  • question_answer
    Calculate the number of moles present in \[400\] grams of\[CaC{{O}_{3}}\].

    A)  \[2\]moles        

    B)         \[3\]moles

    C)  \[1\]mole          

    D)         \[4\]moles  

    Correct Answer: D

    Solution :

     Formula weight of\[CaC{{O}_{3}}\]. \[=40+12+3\times 16=100\,\,a.m.u\] Therefore, \[1\]mole of\[CaC{{O}_{3}}=100\,\,g\] So, \[400\,\,g\] is equal to \[4\]mole\[CaC{{O}_{3}}=100\,\,g\]


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