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Standard XII

Chemistry

Elevation in Boiling Point

Calculate the...

Question

Calculate the mass in grams of an impurity of molar mass $100$ g ${m o l}^{- 1}$ which would be required to raise the boiling point of $50$ g of chloroform by $0.30$ .

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Solution

$K_{b}$ of chloform $= 3.63 K \times K g / m o l$
Noe, $Δ T_{b} = K_{b}$ molarity
$R i g h t a r r o w 0.30 = 3.63 \times \frac{m o l e s o f i m p o r i t y}{p e r K g o f s o l v e n t}$
$R i g h t a r r o w 0.30 = 3.63 \times \frac{M a s s / 100}{1000} \times 50$
$R i g h t a r r o w M a s s = 165.28 g m$

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Calculate the mass in grams of an impurity of molar mass 100 g mol−1 which would be required to raise the boiling point of 50 g of chloroform by 0.30.

Kb of chloform =3.63 K×Kg/molNoe, ΔTb=Kb molarityRightarrow 0.30=3.63×moles of imporityper Kg of solventRightarrow 0.30=3.63×Mass/1001000×50Rightarrow Mass=165.28 gm

Calculate the mass in grams of an impurity of molar mass $100$ g ${m o l}^{- 1}$ which would be required to raise the boiling point of $50$ g of chloroform by $0.30$ .