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Q.

A compound has the empirical formula C10H8Fe. A solution of 0.26 g of the compound in 11.2 g of benzene (C6H6) boils at 80.26oC. The boiling point of benzene is 80.10oC; the Kb is 2.53'C/mo1al. What is the molecular formula of the compound?

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a

C30H24Fe3

b

C10H8Fe

c

C5H4Fe

d

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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