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Pure t - butanol has a freezing point of 2 6 C . When 0 . 2 5 g of an unknown solid was dissolved

Pure t-butanol has a freezing point of 26C. When 0.25g of an unknown solid was dissolved in the t-butanol, the freezing point of the new solution was 22.5C. What is the freezing point depression for this sample?
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