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Posted by on Friday, August 26, 2011 at 3:05am.

A sample of a compound of mercury and bromide with a mass of .389 was found to contain .111g bromine. Its molar mass was found to be 561 g mol-1. What are its empirical and molecular formula. Please detail each step in the process. Thanks in advance!

  • Chemistry - , Friday, August 26, 2011 at 12:07pm

    Omitting coefficients:
    ..........Hg + Br ==> HgBr
    So Hg must be 0.389-0.111 = 0.278g

    moles Hg = 0.278/200.6 =0.00139
    moles Br = 0.111/79.9 = 0.00139

    So ratio is 1:1 and formula is HgBr.
    Check my work.

  • Chemistry - , Saturday, August 27, 2011 at 6:48pm

    Can you explain, why did you omit coefficients? and what about the molecular formula, i think you only did the empirical.

  • Chemistry - , Thursday, April 18, 2013 at 11:58pm

    DrBob222 is SOO close... Yes, the ratio is 1:1, but how does the molecular mass of HgBr compare to the molecular mass given in the problem (this will give you the answer)?

  • Chemistry - , Saturday, October 10, 2015 at 3:57am

    Molecular formula is Hg2Br2. you divide the molecular mass by the molar mass of the imperical formula

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