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3 March, 21:59

The hormone, thyroxine is secreted by the thyroid gland, and has the formula: c15h17no4i4. How many milligrams of iodine can be extracted from 15.0grams of thyroxine?

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  1. 4 March, 00:02
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    9.73 grams of iodine

    Explanation:

    First we calculate the molar mass of the tyroxine C₁₅H₁₇NO₄I₄:

    M = 15 * 12 + 17 * 1 + 1 * 14 + 4 * 16 + 4 * 127 = 783 g/mole

    The taking in account that 1 mole of tyroxine have 4 moles of iodine atoms (508 g) we devise the following reasoning:

    if from 783 g of tyroxine we can extract 508 g of iodine

    the from 15 g of tyroxine we can extract X g of iodine

    X = (15 * 508) / 783 = 9.73 grams of iodine
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