What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100.g of benzene by 0.47°C? K_f of benzene is 5.12°C/m. A)92.6 g/mol B)78.0 g/mol C)10.7 g/mol D)81.8 g/mol E)927 g/mol

Question

Quizplus · Accepted Answer

The molar mass of toluene can be calculated using the formula for freezing point depression: ΔT = Kf * m, where m is the molality. Rearranging gives m = ΔT / Kf. Substituting the given values, m = 0.47°C / 5.12°C/m = 0.0918 mol/kg. The mass of benzene is 0.1 kg, so the moles of toluene = 0.0918 mol/kg * 0.1 kg = 0.00918 mol. The molar mass = mass of toluene / moles of toluene = 0.85 g / 0.00918 mol = 92.6 g/mol.

What Is the Molar Mass of Toluene If 0