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Depression in Freezing Point

If any solute...

Question

If any solute 'A' dimerises in water at 1 atmpressure and the boiling point of this solution is100.52^° C. If 2 moles of A is added to 1 kg of waterand K for water is 0.52^° C/molal, calculate thepercentage association of A(1) 50%(2) 30%(3) 25%(4) 100%

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A

{100.52}^{\circ} C

A

k_{b}

{0.52}^{\circ} C / m o l a l

A

K_{b}

0.52 K k g m o l^{- 1}

50 %

{100.52}^{o}

[K_{b} = 0.52

m o l^{- 1}

K_{f} = 1.86

m o l^{- 1}]

If 2 moles of sugar are dissolved in 1000g of water, the elevation in boiling point of the resulting solution is: (K_b = 0.52 K kg mol^-1):

C u C l_{2}

75 %

K_{b}

0.52 K k g m o l^{- 1}

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