The freezing point of 56.25 g of a pure solvent is measured to be 43.14 ºc. when 2.23 g of an unknown solute (assume the van 't hoff factor = 1.) is added to the solvent the freezing point is measured to be 40.22 ºc. answer the following questions ( the freezing point depression constant of the pure solvent is 7.23 ºc·kg solvent/mol solute).

1.what is the molality of the solution?
? m

2. how many moles of solute are present?

? mol

3.what is the molecular weight of the solute?

? g/mol

the freezing point of 42.26 g of a pure solvent is measured to be 45.45 ºc. when 2.34 g of an unknown solute (assume the van 't hoff factor = 1.) is added to the solvent the freezing point is measured to be 42.52 ºc. if the freezing point depression constant of the pure solvent is 7.03 ºc·kg solvent/mol solute calculate the molar mass of the solute.
? g/mol