CBSE 2023 · Region 1 · Set 2 · Q19 · 2 marks
A solution is prepared by dissolving $\displaystyle 10$ g of non-volatile solute in $\displaystyle 200$ g of water. It has a vapour pressure of $\displaystyle 31.84$ mm Hg at $\displaystyle 308$ K. Calculate the molar mass of the solute. (Vapour pressure of pure water at $\displaystyle 308 \mathrm{~K}=32 \mathrm{~mm} \mathrm{Hg}$ ) $\displaystyle 2$
Marking-scheme solution
\[\frac{p^{0}-p_{A}}{P A^{0}}=\frac{\dfrac{W_{A}}{M_{A}}}{\dfrac{W_{A}}{M_{A}}+\dfrac{W_{B}}{M_{B}}}=\frac{\dfrac{W_{B}}{M_{B}}}{\dfrac{W_{A}}{M_{A}}}
\]
SolutionsColligative Properties and Determination of Molar MassApplyvery_short_answermedium
More from Solutions
- 0.3 g of acetic acid (M=60 g mol^-1) dissolved in 30 g of benzene shows a depression in freezing point equal…2023 · asked 6×
- Define molal depression constant. How is it related to enthalpy of fusion? OR What type of deviation is shown…2024 · asked 3×
- When a liquid and its vapour are at equilibrium and the pressure is suddenly decreased:2026 · asked 3×
- Shweta mixed two liquids A and B of 10 mL each. After mixing, the volume of the solution was found to be 20 ·…2025 · asked 3×
- Explain the following with the help of Henry's law: (i) Bends (ii) Anoxia OR How does sprinkling of salt help…2026 · asked 3×
- Calculate the vapour pressure of a solution containing 61 g of benzoic acid (molar mass =122 g mol^-1 )…2026 · asked 3×
- The boiling point of one molal NaCl solution, assuming NaCl to be completely dissociated in water is: (K b.…2026 · asked 3×
- Give reasons: Cooking is faster in pressure cooker than in an open pan. On mixing liquid X and liquid Y,…2025 · asked 3×
CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.