Pure CS2 melts at -112°C. 228 grams of propylene glycol crystals is mixed with 500 grams of CS2. If kf of CS2 = -3.83 K kg mol-1 what is the depression in freezing point?

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Pure CS<sub>2</sub> melts at -112°C. 228 grams of propylene glycol crystals is mixed with 500 grams of CS<sub>2</sub>. If k<sub>f</sub> of CS<sub>2</sub> = -3.83 K kg mol<sup>-1</sup> what is the depression in freezing point?