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  4. Vapour pressure of a solution of 5g of non- electrolyte in 100g of water at a particular temperature is 2985N/m2 . The vapour pressure of pure water is 3000N/m2 . The molecular weight of the solute is

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Q. Vapour pressure of a solution of $5g$ of non- electrolyte in $100g$ of water at a particular temperature is $2985N/m^{2} \, $ . The vapour pressure of pure water is $3000N/m^{2} \, $ . The molecular weight of the solute is

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Solution:

$\frac{P^{o} - P_{s}}{P^{o}}=\frac{\frac{W_{2}}{M_{2}}}{\frac{W_{1}}{M_{1}}}$
$=\frac{\text{3000} - \text{2985}}{\text{3000}}=\frac{\frac{5}{M_{2}}}{\frac{\text{100}}{\text{18}}}\text{ or }M_{2}=\text{180}$