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1 November, 11:21

What is the empirical formula for a compound that is 29.44/% calcium, 23.55% sulfur, and 47.01% oxygen? This compound is a common ingredient in plaster

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  1. 1 November, 11:37
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    Empirical formula is CaSO₄.

    Explanation:

    Given dа ta:

    Percentage of calcium = 29.44%

    Percentage of sulfur = 23.55%

    Percentage of oxygen = 47.01%

    Empirical formula = ?

    Solution:

    Number of gram atoms of Ca = 29.44 / 40 = 0.74

    Number of gram atoms of S = 23.55 / 32 = 0.74

    Number of gram atoms of O = 47.01 / 16 = 3

    Atomic ratio:

    Ca : S : O

    0.74/0.74 : 0.74/0.74 : 3/0.74

    1 : 1 : 4

    Ca : S : O = 1 : 1 : 4

    Empirical formula is CaSO₄.
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