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

  • question_answer
    What weight of calcium contains the same number of atoms as those in \[3\text{ }g\] of carbon?

    A) \[10\,\,g\]                        

    B)        \[20\,\,g\]

    C) \[30\,\,g\]                      

    D)        \[40\,\,g\]

    Correct Answer: A

    Solution :

     No. of atoms in\[3\,\,g\]of carbon\[=\]\[0.25\times \]Avogadro's number. The Weight of calcium which contains the same as those in a \[3g\] carbon\[=0.25\times GMW\]of\[Ca\]\[=0.25\times 40=10\,\,g\] \[\therefore \]The number of atoms present in\[3\] grams (\[0.4\] mole) of carbon is the same as in \[10\,\,g\] (\[0.4\]moles) of calcium.


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