A solution made by dissolving 150.0 g of an unknown compound in 320.0 mL of benzene to make a solution which has a freezing point 18.6 °C lower than that of pure benzene. Kf for benzene is 5.12 °C/m and the density of benzene is 0.877 g/mL. The molality of the solution is 3.63 m. What quantity in moles of the unknown compound were dissolved in the solution?

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