Molar mass = 144.2 g/mol.
<h3>Calculate
Molar mass.</h3>
Formula to solve this: ΔT = Kf . m
ΔT → Freezing point of pure solvent - Freezing point of solution
0°C - (-1.94°C) = 1.86 °C/m . m
1.94°C / 1.86 m/°C = m → 1.04 m
1.04 are the moles of solute in 1kg of solvent → molality (mol/kg)
Let's convert the mass of our solvent in kg to determine the moles.
80 g . 1kg / 1000 g = 0.08 kg
Molality . kg of solvent → Solute moles
1.04 mol/kg . 0.080 kg = 0.0832 moles
These are the moles of 12 g of solute. To find the molar mass → g/mol
12 g / 0.0832 mol = 144.2 g/mol
To learn more about Molar mass from the given link:
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