Given that the gas constant R = 8.3145 J mol⁻¹K⁻¹ = 0.082057 L atm mol⁻¹K⁻¹, show units in numerical work. A given liquid substance is known to freeze at - 8.3°C when the external pressure is 1.3 bar, and its density (upon freezing) is 1.2 g/mL. Calculate the molar mass of the solute if 0.68 g of the solute is dissolved in 20 mL of the solvent. Assume the solute doesn't dissociate or associate in the solution.