Question 10
The unit of ebuilioscopic constant is
(a) $K k g m o l^{- 1} o r K (m o l a l i t y)^{- 1}$ (b) $m o l k g K^{- 1} o r K^{- 1} (m o l a l i t y)$
(c) $k g m o l^{- 1} o r K^{- 1} (m o l a l i t y)^{- 1}$ (d) $K m o l k g^{- 1} o r (m o l a l i t y)$

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Solution

(a) As we know from elevation in boiling point that
$Δ T_{b} = K_{b} m K_{b} = \frac{Δ T_{b}}{m} U n i t o f K_{b} = \frac{U n i t o f Δ T_{b}}{U n i t o f m} = \frac{K}{m o l a l i t y} = \frac{K}{m o l k g^{-} 1} = K m o l^{- 1} k g$

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