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

  • question_answer The weight of \[1\times {{10}^{22}}\]molecules of \[CuS{{O}_{4}}.5{{H}_{2}}O\]is [IIT 1991]

    A)                 41.59 g  

    B)                 415.9 g

    C)                 4.159 g  

    D)                 None of these

    Correct Answer: C

    Solution :

               [\[\because \] Molecular weight of \[CuS{{O}_{4}}.5{{H}_{2}}O\] \[=63.5+32+64+90\]\[=249.5\]]                    \[6\times {{10}^{23}}\]molecules has weight \[=249.5gm\]                    \[1\times {{10}^{22}}\] molecules has weight \[=\frac{249.5\times 1\times {{10}^{22}}}{6\times {{10}^{23}}}\]                                                                 \[=41.58\times {{10}^{-1}}\] \[=4.158\]

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