What molality of a nonvolatile, nonelectrolyte solute is needed to raise the boiling point of water by 7.10 ∘ C ( K b = 0.520 ∘ C / m ) ?

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What molality of a nonvolatile, nonelectrolyte solute is needed to raise the boiling point of water by       7.10    ∘    C     (      K    b    =      0.520    ∘    C      /    m  ) ?

kazneni3tr2b · Accepted Answer

Molality of a non-volatile, non-electrolyte solute that is needed to raise the boiling point of water by       7.10    ∘    C     (      K    b    =      0.520    ∘    C      /    m  ) is to be calculated.The properties that depend only on the concentration of the solute are known as Colligative properties. Such colligative properties are vapor pressure lowering, boiling point elevation, freezing point depression and osmotic pressure.The given question is related to boiling point elevation.When a non-volatile solute is added to solution, its vapor pressure is lowered which leads to the increase in its boiling point. This elevation in boiling point is directly proportional to the molal concentration of solute.  △      T    b    ∞  m    △      T    b    =      K    b    mWhere,  △      T    b   is elevation in boiling point.m is molality of thr solute.      K    b   is boiling point elevation constantCalculate the molality of the non-volatile, non-electrolyte solution,Given:       K    b    =      0.520    ∘    C      /    m    △      T    b    =      7.10    ∘    C    △      T    b    =      K    b    m        7.20    ∘    C  =  (      0.520    ∘    C      /    m  )  ×  molality of the solute    Molalty of solute  =                    7.10        ∘            C                      0.520        ∘            C        =  13.66     mHence, molality of a non-volatile, non-electrolyte solute that is needed to rise the boiling point of water by       7.10    ∘    C  (      K    b    =      0.520    ∘    C      /    m  ) is 13.66 molal.

What molality of a nonvolatile, nonelectrolyte solute is needed to raise the boiling point of water

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