1.

When 20 g of naphthoic acid (C_(11)H_(8)O_(2)) is dissolved in 50 g of benzene (K_(f)=1.72 "K kg mol"^(-1)) a freezing point depression of 2K is observed. The Van't Hoff factor (i) is :

Answer»

0.5
1
2
3

Solution :`DeltaT_(f)=iK_(f)m`
`m=((20)/(172)xx1000)/(50)=2.326`
`:.2=ixx1.72xx2.326`
or `i=(2)/(1.72xx2.316)=0.50`


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