JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer The weight of a molecule of the compound \[{{C}_{60}}{{H}_{122}}\]is [AIIMS 2000]

    A)                 \[1.4\times {{10}^{-21}}\]g             

    B)                 \[1.09\times {{10}^{-21}}\]g

    C)                 \[5.025\times {{10}^{23}}\]g          

    D)                 \[16.023\times {{10}^{23}}\]g

    Correct Answer: A

    Solution :

               Molecular weight of \[{{C}_{60}}{{H}_{122}}\]\[=12\times 60+122\times 1\]                 \[=720+122=842\]                    \[\because \]   \[6\times {{10}^{23}}\]molecule \[{{C}_{60}}{{H}_{122}}\]has mass = 842gm                                 \[\therefore \]   1 molecule \[{{C}_{60}}{{H}_{122}}\]has mass   \[\frac{842}{6\times {{10}^{23}}}\] \[=140.333\times {{10}^{-23}}gm\] \[=1.4\times {{10}^{-21}}gm\].

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