A compound has the empirical formula C10H8Fe. A solution of 0.26g of the compound in 11.2 g of benzene (C6H6 ) boils at 80.26°C. The boiling point of benzene is 80.10°C; the Kb is 2.53°C/molal. What is the molecular formula of the compound?

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C30H24Fe3

C10H8Fe

C5H4Fe

C20H16Fe2

answer is D.

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Detailed Solution

Tb=80.26, ΔTb=0.160.16=2.53×0.26/M11.20×1000;M≈367That is almost molar mass of C20H16Fe2.

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