CUET · CHEMISTRY · PYQ PAPER 2023
Molar mass of a non-volatile solute (in g/mol) in its \(10\%\) by mass aqueous solution showing \(2\%\) decrease in its vapour pressure is :
- A 100
- B 98
- C 90
- D 95
Answer & Solution
Correct Answer
(B) 98
Step-by-step Solution
Detailed explanation
\( \frac{\Delta P}{P^0} = \chi_{solute} = \frac{n_{solute}}{n_{solute} + n_{solvent}} \) \( n_{solvent} = \frac{90 \text{ g}}{18 \text{ g/mol}} = 5 \text{ mol} \) \( 0.02 = \frac{\frac{10}{M_{solute}}}{\frac{10}{M_{solute}} + 5} \)…
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