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22 April, 14:07

In performing this week's bromination reaction, if you were to start with 126 mg of acetanilide (135.17 g/mol), calculate the theoretical yield of 4-bromoacetanilide (214.06 g/mol), in mg. Assume an excess of bromine. Enter your answer as digits only, no units, using the proper number of significant figures.

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  1. 22 April, 14:10
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    Theoretical yield of C8H8BrNO:

    In moles

    0.000945

    In grams

    0.204

    Explanation:

    Theoretical yield of a reaction is defined as the quantity of the product obtained from the complete conversion of a limiting reactant in a chemical reaction. Theoretical yield can be expressed as grams or moles.

    Equation of reaction:

    C8H9NO + Br2 - -> C8H8BrNO + HBr

    Since C8H9NO is the limiting reagent, 1 mole of C8H9NO reacted to form 1 mole of C8H8BrNO

    Mass of C8H9NO = 129 mg

    = 0.129 g.

    Molar mass of C8H9NO = 135.17 g/mol.

    Number of moles of C8H9NO = mass/molar mass.

    = 0.129/135.17

    = 0.00095 moles of C8H9NO

    Since 1 mole of C8H9NO yielded 1 mole of C8H8BrNO

    Therefore, 0.000954 moles of C8H8BrNO

    Theoretical yield (in grams) = molar mass * number of moles

    = 214.06 * 0.00095

    = 0.204 of C8H8BrNO
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