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NEET-XII-Chemistry

02: Solutions

with Solutions - page 3
Qstn# B-15 Prvs-QstnNext-Qstn
  • #15
    An
    aqueous solution of 2% non-volatile solute exerts a pressure of 1.004
    bar at the normal boiling point of the solvent. What is the molar
    mass of the solute?
    Ans : Here,
    Vapour pressure of the
    solution at normal boiling point (p1) = 1.004 bar
    Vapour pressure of pure
    water at normal boiling point
    Mass of solute, (w2)
    = 2 g
    Mass of solvent
    (water), (w1) = 98 g
    Molar mass of solvent
    (water), (M1) = 18 g mol-1
    According to Raoult’s
    law,

    = 41.35 g mol-1
    Hence, the molar mass
    of the solute is 41.35 g mol-1.