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NEET AIPMT SOLVED PAPER SCREENING 2005

  • question_answer
                    The mole fraction of the solute in one molal aqueous solution is:                                             

    A)                 0.027          

    B)                 0.036    

    C)                 0.018    

    D)                 0.009

    Correct Answer: C

    Solution :

                              Molality of solution = Mole of solute per kg of solvent                 So 1 m = 1 mole of solute per 1000 g of solvent                 Hence, moles of solute in 1 m aqueous solvent = 1                 moles of solvent in 1 m aqueous solution                 \[=\frac{1000}{18}=55.55\]                 Mole fraction of solute in 1 m solution                 \[=\frac{1}{1+55.55}=\frac{1}{56.55}=0.0176\approx 0.018\]


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