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Camphor (C10H16O) freezes at 179.8°C, and it has a particularly large freezing point depression constant, Kf = 40.0°C/m. When 0.186 g of an organic substance of unknown molar mass is dissolved in 22.01 g of liquid camphor, the freezing point of the mixture is found to be 176.7°C. What is the molar mass of the solute?