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What is the g-molecular mass of nonioniz...

What is the g-molecular mass of nonionizing solid if 10 g of this solid dissolved in 100 g of water, forms a solution which froze at `-1.22^(@)` C ? `(K_(f)=1.86 K kg mol^(-1))`

A

`265 g//mol`

B

`152 g//mol`

C

`130 g//mol`

D

`65 g//mol`

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaT_(f)=1.22^(@)C`
`(w)/(Mw)xx(1000)/(W_(A))xxK_(f)=1.22`
`(10)/(Mw)xx(1000)/(100)xx1.86=1.22`
`Mw=(186)/(1.22)=152.4`
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