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What I'm trying to do is the following:

__Step 1:__Tf = Kf . m

I took Tf = 1.4

Kf = 1.86

and found the molality as 0.75

__Step 2:__then I used the molality equation which is

**molality = moles solute/kg solvent**

molality = 0.75

kg solvent = 0.535 kg

and got the no. of moles as 119 g/mol

Step 3Step 3

no. of moles = mass /molar mass and

got 47.6 g for mass

but the answer is still wrong ... I don't know where I'm making mistake. It's an online assignment so I don't know what the answer should be. But please guys help me and check if I'm doing everything right.