The freezing point of this solution is 650 c lower than the, Chemistry

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The freezing point of this solution is 650 c lower than the

Another solution is prepared by dissolving 0.7500g of an unknown non-electrolite in 15g of Carbon tetra-chloride (CCl4, Kf=-30 C/molal). The freezing point of this solution is 6.50 C lower than the freezing point of pure carbon tetrachloride. Explain what is the molar mass of the unknown?

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