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BITSAT 2012
Exam
BITSAT
Year
2012
Subject
Chemistry
Chapter
Solutions

BITSAT 2012 · Chemistry · Solutions

If the elevation in boiling point of a solution of 10 g of solute...

If the elevation in boiling point of a solution of 10g10 \mathrm{ g} of solute (mol.wt=100)(\mathrm{mol}. \mathrm{wt}=100) in 100g100 \mathrm{ g} of water is ΔTb\Delta T b, the ebullioscopic constant of water is

Options

  1. AΔTb10\frac{\Delta T_{b}}{10}
  2. BΔTb\Delta T_{b}
  3. C10ΔTb10 \Delta T_{b}
  4. D100ΔTb100 \Delta T_{b}

Correct answer

B. ΔTb\Delta T_{b}

Step-by-step solution

m=1000×kb×wW×ΔTb\mathrm{m}=\frac{1000 \times \mathrm{k}_{b} \times \mathrm{w}}{W \times \Delta T_{b}} or \quadkb=m×W×ΔTb1000×w=100×100×ΔTb1000×10=ΔTb\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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