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26 April, 08:29

Mercury chloride is a commercial fungicide. If the molar mass is 470 g/mol and the percent composition is 85.0% Hg and 15.0% Cl, what is the empirical and molecular formula of the fungicide?

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  1. 26 April, 08:58
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    dа ta: molar mass 470 g/mol

    Percent composition:

    Hg = 85.0%

    Cl = 15.0%

    Solution:

    1) Convert % to molar ratios

    A. Base: 100 g

    => Hg = 85.0 g / 200.59 g/mol = 0.4235 mol

    Cl = 15.0 g / 35.45 g/mol = 0.4231 mol

    B. divide by the higher number and round to whole number

    Hg = 0.4325 / 0.4231 = 1.00

    Cl = 0.4231 / 0.4231 = 1.00

    => Empirical formula = Hg Cl

    2) Find the mass of the empirical formula:

    HgCl: 200.59 g/mol + 35.45 g/mol = 236.04

    3) Determine how many times is the empirical mass contained in the molecular mass:

    470 g/mol / 236.04 = 1.99 ≈ 2

    => Molecular formula = Hg2 Cl2.

    Answers:

    Empirical formula HgCl

    Molecular Formula Hg2Cl2
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