1.

The freezing point depression constant for water is -1.86cm^(-1). If "5.00 g "Na_(2)SO_(4) is dissolved in "45.0 g "H_(2)O, the freezing point is changed by -3.82^(@)C. Calculate the van't Hoff factor for Na_(2)SO_(4)

Answer»

0.381
2.05
2.63
3.11

Solution :`DeltaT_(f)=i xxK_(f)xxm =i xxK_(f)xx(w_(2))/(M_(2))xx(1)/(w_(1))xx1000`
`3.82=ixx1.86xx(5)/(142)xx(1)/(45)xx1000`
`""("Molar mass of "Na_(2)SO_(4)=142)`
`"or"i=2.62`


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