The balanced chemical equation for the preparation of 4-bromoacetanilide from acetanilide and bromine is:C8H9NO + Br2 C8H8BrNO + HBrTo calculate the theoretical yield of 4-bromoacetanilide, we first need to determine the number of moles of acetanilide used in the reaction. The molecular weight of acetanilide is approximately 135.17 g/mol.moles of acetanilide = mass of acetanilide / molecular weight of acetanilide moles of acetanilide = 5 g / 135.17 g/mol 0.037 molSince the reaction has a 1:1 stoichiometry, the number of moles of 4-bromoacetanilide produced will be equal to the number of moles of acetanilide used.moles of 4-bromoacetanilide = 0.037 molNow, we can calculate the theoretical yield of 4-bromoacetanilide by multiplying the number of moles by its molecular weight. The molecular weight of 4-bromoacetanilide is approximately 214.06 g/mol.theoretical yield of 4-bromoacetanilide = moles of 4-bromoacetanilide molecular weight of 4-bromoacetanilide theoretical yield of 4-bromoacetanilide = 0.037 mol 214.06 g/mol 7.91 gSo, the theoretical yield of 4-bromoacetanilide is approximately 7.91 grams.