Freezing point depression = Tf= freezing point of water - freezing.pdf

Freezing point depression = Tf
= freezing point of water - freezing point of solution
= 0.0 - 1.7 = 1.7oC
Freezing point depression constant of water Kf = 1.86oC/m
Tf = Kf x m
Molality m = Tf/Kf
= 1.7/1.86 = 0.9140m
Mass of water = 150.0 g = 0.150 kg
Molality = moles of compound/mass of water in kg
= moles of compound/0.150 = 0.9149
Moles of compound = 0.9149 x 0.150 = 0.1371 mol
Molar mass of compound = mass/moles of compound
= 40.2/0.1370
= 293 g/mol
Solution
Freezing point depression = Tf
= freezing point of water - freezing point of solution
= 0.0 - 1.7 = 1.7oC
Freezing point depression constant of water Kf = 1.86oC/m
Tf = Kf x m
Molality m = Tf/Kf
= 1.7/1.86 = 0.9140m
Mass of water = 150.0 g = 0.150 kg
Molality = moles of compound/mass of water in kg
= moles of compound/0.150 = 0.9149
Moles of compound = 0.9149 x 0.150 = 0.1371 mol
Molar mass of compound = mass/moles of compound
= 40.2/0.1370
= 293 g/mol.

1. Freezing point depression = Tf
= freezing point of water - freezing point of solution
= 0.0 - 1.7 = 1.7oC
Freezing point depression constant of water Kf = 1.86oC/m
Tf = Kf x m
Molality m = Tf/Kf
= 1.7/1.86 = 0.9140m
Mass of water = 150.0 g = 0.150 kg
Molality = moles of compound/mass of water in kg
= moles of compound/0.150 = 0.9149
Moles of compound = 0.9149 x 0.150 = 0.1371 mol
Molar mass of compound = mass/moles of compound
= 40.2/0.1370
= 293 g/mol

Solution

Freezing point depression = Tf
= freezing point of water - freezing point of solution
= 0.0 - 1.7 = 1.7oC
Freezing point depression constant of water Kf = 1.86oC/m
Tf = Kf x m
Molality m = Tf/Kf
= 1.7/1.86 = 0.9140m
Mass of water = 150.0 g = 0.150 kg
Molality = moles of compound/mass of water in kg
= moles of compound/0.150 = 0.9149
Moles of compound = 0.9149 x 0.150 = 0.1371 mol
Molar mass of compound = mass/moles of compound
= 40.2/0.1370
= 293 g/mol