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JEE Main & Advanced Sample Paper JEE Main Sample Paper-10

  • question_answer
    One atom of an element y weighs\[6.64\times {{10}^{-23}}\]g. Then, find the numbers of moles of atom in 20 kg

    A)  300                       

    B)  100

    C)  200                       

    D)  500

    Correct Answer: D

    Solution :

     Atomic weight of element \[y=6.64\times {{10}^{-32}}\times {{N}_{4}}=40\] Number of moles of\[y=\frac{20\times 1000}{40}=500\]


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