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If the elevation in boiling point of a solution of $10 \mathrm{~g}$ of solute $(\mathrm{mol} . \mathrm{wt}=100)$ in $100 \mathrm{~g}$ of water is $\Delta T b$, the ebullioscopic constant of water is
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$\Delta T_{b}$
$\mathrm{m}=\frac{1000 \times \mathrm{k}_{b} \times \mathrm{w}}{W \times \Delta T_{b}}$
or $\quad \begin{aligned} k_{\mathrm{b}} &=\frac{\mathrm{m} \times W \times \Delta T_{b}}{1000 \times \mathrm{w}}=\frac{100 \times 100 \times \Delta T_{b}}{1000 \times 10} \\ &=\Delta T_{b} \end{aligned}$
or $\quad \begin{aligned} k_{\mathrm{b}} &=\frac{\mathrm{m} \times W \times \Delta T_{b}}{1000 \times \mathrm{w}}=\frac{100 \times 100 \times \Delta T_{b}}{1000 \times 10} \\ &=\Delta T_{b} \end{aligned}$
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