Chemistry

A 1.00% by mass MgSO4 solution has a freezing point of -.192°C. Water has a Kf of 1.86 (KxKg)/mol.
a.) Estimate the van’t Hoff i factor from the data.
b.)Determine the total molality of all solute species.
c.) Calculate the percentage dissociation of MgSO4 in this solution.

I understand part A and got i=1.23 but I don’t understand part B or part C.

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