Tf=
Tb=
Change in freezing point = Kf*(molality)*i
where i is the van’t Hoff factor
Kf for H2O = 1.86 C/molal
3.40 = 1.86(0.730)i
i =3.40 / 1.86(0.730)
i = 2.50
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Verified answer
Change in freezing point = Kf*(molality)*i
where i is the van’t Hoff factor
Kf for H2O = 1.86 C/molal
3.40 = 1.86(0.730)i
i =3.40 / 1.86(0.730)
i = 2.50