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25 February, 06:19

Monosodium glutamate, known as MSG, is sometimes added to food to enhance flavor. Analysis determined this compound to be 35.5% C, 4.77% H, 8.29% N, 13.6% Na, and 37.9% O. What is its empirical formula? (Enter your answer using the format CO2 for CO2.)

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  1. 25 February, 08:56
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    Assume 100g, then percents become grams of each. divide by molar mass to get moles of each.

    carbon

    35.5 / 12 = 2.9 mol

    hydrogen

    4.77 / 1 = 4.77 mol

    nitrogen

    8.29 / 14 = 0.59 mol

    sodium

    13.6 / 23 = 0.59 mol

    now divide all by the smallest mol (0.59) to get the number of each in the empirical formula.

    carbon

    2.9 / 0.59 = 4.9

    hydrogen

    4.77 / 0.59 = 8

    nitrogen

    0.59 / 0.59 = 1

    sodium

    0.59 / 0.59 = 1

    empirical formula = C5H8NNa
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