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

  • question_answer The mass of a molecule of water is                     [Bihar CEE 1995]

    A)                 \[3\times {{10}^{-26}}\]kg              

    B)                 \[3\times {{10}^{-25}}\]kg

    C)                 \[1.5\times {{10}^{-26}}\]kg

    D)                 \[2.5\times {{10}^{-26}}\]kg

    Correct Answer: A

    Solution :

               \[6\times {{10}^{23}}\]molecules has mass \[=18gm\]                    1 molecules has mass \[=\frac{18}{6\times {{10}^{23}}}\]\[=3\times {{10}^{-23}}gm\]                                                     \[=3\times {{10}^{-26}}kg\].


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