1.

After adding non-volatile solute freezing point of water decreases to -0.186^(@)C. Calculate Delta T_(b) if K_(f)=1.86 " K kg mol"^(-1) and K_(b)=0.21 "K kg mol"^(-1).

Answer»

1.86
0.521
0.0186
0.0521

Solution :`DeltaT_(f)=K_(f)xxm`
`0.186=1.86 xx m`
or `m=(0.186)/(1.86)=0.10`
`DELTA T_(b)=K_(b)xx m=0.521 xx 0.10`
`DeltaT_(b)=K_(b) xx m= 0.521 xx 0.10`
`=0.0521`.


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