1.

A solution containing 0.10 g of non-volatile solute X (molar mass : 100) in 200 g of benzene depresses the freezing point of benzene by 0.25^(@)C while 0.50 g of another non-volatile solute Y in 100 g of benzene also depresses the freezing point of benzene by 0.25^(@)C. What is the molecular mass of Y ?

Answer»

50
100
150
1000

Solution :`DeltaT_(f)=(1000K_(f)w_(2))/(w_(1)xxM_(2))=(1000K_(f)W'_(2))/(w'_(1)xxM'_(2))`
`or M'_(2)=(w'_(2))/(w'_(1))xx(w_(1))/(w_(2))xxM_(2)=(0.50)/(100)xx(200)/(1.10)XX100`
= 1000


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