J & K CET Medical J & K - CET Medical Solved Paper-2015

  • question_answer
    The number of Na atom in 46 g Na (atomic weight of Na = 23) is

    A)  \[6.023\times {{10}^{23}}\]        

    B)  2

    C)  1                 

    D)  \[12.046\times {{10}^{23}}\]

    Correct Answer: D

    Solution :

     \[\because \]23 g of Na contains\[=6.023\times {{10}^{23}}\]atoms \[\therefore \]1 g of Na contains\[=\frac{6.023\times {{10}^{23}}}{23}atoms\] \[\therefore \]46 g of Na contains\[=\frac{6.023\times {{10}^{23}}}{23}\times 46\,atoms\] \[=12.046\times {{10}^{23}}atoms\]


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