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  • In Oswald and walker apparatus, dry a air is passed through a solution containing 4 gram of an organic nonvolatile solute in 350 ml of water. Then air was passed through pure water a

In Oswald and walker apparatus, dry a air is passed through a solution containing 4 gram of an organic nonvolatile solute in 350 ml of water. Then air was passed through pure water and then through a U-tube containing anhydrous \mathrm{Cd}_2. The mass lost in solution is 34 grams and mass gained in U-tube is 35.84 grams. Calculate the molecular mass of the organic solvent.

Option: 1

42.5 g


Option: 2

60.5 g


Option: 3

55.6 g


Option: 4

40.3 g


Answers (1)

best_answer

\frac{\text { Loss of mass solvent }}{\text { Gain in mass of } \text { CaCl }_2}=\mathrm{\frac{P_0-P}{P_0}}=\mathrm{\frac{w}{m} \times \frac{M}{w}}

\mathrm{ \frac{35.84-34}{35.84}=\frac{40}{m} \times \frac{18}{350} }\\

\\0.051 =\frac{720}{350 \mathrm{m}} \\\\ \\350 \mathrm{m} =\frac{720}{0.051} \\\\ \\\text{m} =\frac{720}{350 \times 0.051}

\mathrm{m = 40.3 \; \text{g}}

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