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A student weighs out 1.394 g of t-butyl alcohol into a large test tube and measures...

A student weighs out 1.394 g of t-butyl alcohol into a large test tube and measures the freezing point of the pure solvent to be 21.50 °C. Next the student weighs out 1.068 g of water and adds it to the test tube with the t-butyl alcohol and measures the freezing point of the mixture to be 15.0 °C. What is the freezing point depression constant, Kf, of the t-butyl alcohol?

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