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WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    \[4.6\times {{10}^{22}}\]atoms of an element weigh 13.8g. The atomic weight of that element is

    A)  290                                       

    B)  180

    C)  34.4                                      

    D)  10.4

    Correct Answer: B

    Solution :

                     \[4.6\times {{10}^{22}}\] atoms weigh = 13.8 g Hence, \[6.02\times {{10}^{13}}\]atoms will weigh \[=\frac{13.8\times 6.02\times {{10}^{23}}}{4.6\times {{10}^{22}}}=180.6g\](molar mass)


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