1.

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

Answer»

<P>60
120
180
380

Solution :`(P^(@)-P_(s))/(P^(@))=((W_(2))/(M_(2)))/((W_(1))/(M_(1)))=(300-2985)/(3000)=((5)/(M_(2)))/((100)/(18))` or `M_(2)=180`


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