A 0.350-g sample of a nonvolatile compound dissolves in 12.0 g cyclohexane, producing a solution that freezes

Question:

A 0.350-g sample of a nonvolatile compound dissolves in 12.0 g cyclohexane, producing a solution that freezes at 0.83 °C. Cyclohexane has a freezing point of 6.50 °C and a freezing-point depression constant of 20.2 °C/molal. What is the molar mass of the solute?

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