Assume that the density of water is 1.00 g/ml . Calculate the quantity of KBr that would need to be added to lower the freezing point of 535 ml of water by 1.40 degree celsius: 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 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.