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24 July, 20:46

A compound is 44.7% P and the rest O. Determine its emperical formula.

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  1. 25 July, 00:18
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    P₅O₁₂

    Explanation:

    Assume that you have 100 g of the compound.

    Then you have 44.7 g P and 55.3 g O.

    1. Calculate the moles of each atom

    Moles of P = 44.7 * 1/30.97 = 1.443 mol Al

    Moles of O = 55.3 * 1/16.00 = 3.456 mol O

    2. Calculate the molar ratios.

    P: 1.443/1.443 = 1

    O: 3.456/1.443 = 2.395

    3. Multiply by a number to make the ratio close to an integer

    P: 5 * 1 = 5

    O: 5 * 2.395 = 11.97

    3. Determine the empirical formula

    Round off all numbers to the closest integer.

    P: 5

    O: 12

    The empirical formula is P₅O₁₂.
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