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25 July, 16:26

Analysis of a compound indicates that it contians 1.04 g k, 0.70 g cr, and 0.86 g o. find its empirical formula. 1. k2cro3 2. kcro4 3. k2cro4 4. kcro3

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  1. 25 July, 16:41
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    Empirical formula of a chemical compound is the simplest positive integer ratio of atoms in the compound.

    The first step is getting the number of moles of each.

    Potassium - 1.04/39 = 0.0267

    Chromium - 0.7 / 52 = 0.0135

    Oxygen - 0.86/16 = 0.05375

    Then we divide each with the smallest number,

    0.0267/0.0135 = 1.98

    0.0135/0.0135=1

    0.05375/0.0135 = 3.98

    Therefore the ratio is 2:1:4

    Hence the empirical formula is K2CrO4
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