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30 August, 15:19

Allicin is the compound responsible for the characteristic smell of Garlic. An analysis of the compound gives the following percent composition by mass; C = 44.4 percent, H = 6.21 percent. S = 39.5 percent, O = 9086 percent. Calculate its empirical formula. What is its molecular formula given that its molar mass is about 162 g?

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  1. 30 August, 16:56
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    The empirical formula is same as the molecular formula = C6H10S2O

    Explanation:

    we start by dividing the percentage of each of the elements by their atomic mass

    Carbon = 44.4/12 = 3.7

    Hydrogen = 6.21/1 = 6.21

    Sulphur = 39.5/32 = 1.234375

    oxygen = 9.89/16 = 0.618125

    That of oxygen is smallest so we divide all by that of oxygen

    C = 3.7 / 0.618125 = 6

    H = 6.21 / 0.618125 = 10

    S = 1.234375 / 0.618125 = 2

    Automatically, oxygen is 1

    So the empirical formula is;

    C6H10S2O

    Let's get its molecular formula. We multiply each of the subscript by the number;

    (72 + 10 + 64 + 16) n = 162

    162n = 162

    n = 1

    So the molecular formula is same as the empirical formula
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