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JEE Main & Advanced Chemistry Solutions / विलयन Question Bank Method of expressing concentration of solution

  • question_answer
    If 5.85 gms of \[NaCl\] are dissolved in 90 gms of water, the mole fraction of \[NaCl\]is [CMC Vellore 1991; MP PMT 1994; AFMC 1998]

    A)                 0.1         

    B)                 0.2

    C)                 0.3         

    D)                 0.01

    E)                 0.0196

    Correct Answer: E

    Solution :

               5.85 g NaCl = \[\frac{5.85}{58.5}\,mole=0.1\,\,mol\]            90 g \[{{H}_{2}}O=\frac{90}{18}\,moles=5\,\,moles\]                 mole fraction of NaCl = \[\frac{0.1}{5+0.1}\approx 0.0196\].


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