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Determine the empirical formula.

A 4.00-g sample of iodine was reacted completely with excess bromine. The mass of the compound formed was 11.56 g. Determine the empirical formula.
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Answer #1

mass of the compound = 11.56 g

mass of I = 4.00 g

and the remaining = 11.56 - 4 = 7.56 g is Br.


Then


moles of I = 4.00 g/(126.9 g/mol) = 0.0315 mol

moles Br = 7.56 g /(79.9 g/mol) = 0.0946 mol


I              Br

0.0315        0.0946

1                   3


the empirical formula of this compound = IBr3


answered by: jobslabs
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