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Portland State UniversityCH 222 When 6

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Portland State UniversityCH 222

When 6.85 g of an unknown compound composed of the elements C, H, O and F was dissolved in 81.5 g of benzene the solution had a freezing point of 3.16 ^oC. The pure solvent has a freezing point of 5.50 ^oC and a K_f of 5.12 ^oC/m. The unknown compound has mass % values of 52.2% C, 2.74% H, 34.8% O and 10.3% F. What is the molecular formula of the compound?

C₈H₅O₄F

C₁₆H₁₀O₈F₂

C₄H₃O₂F

none of the answers are correct