Question 8 Not yet answered Marked out of 1.00000 Use the following atomic weigh

Question

Question 8 Not yet answered Marked out of 1.00000 Use the following atomic weights and quantities to calculate the overall % yield of dbenz ketone. Remember that your eld must be based on the limiting reagent, and that grams must be converted to moles. For problems not involving a one to one stoichiometry it may be easier to calculate the theoretical yield in grams from both reagents to determine which is truly the limiting reagent. Filling out most of the chart will help. Give only two significant digits in your answer. If after rounding the answer is a whole number, do not include a decimal point. C=12, H=1,Fe = 56, O = 16 Flag question phenylacetic acid iron dibenzyl ketone formula formula weight grams moles 2.091 0.467 1.243 theoretical yield (g) 96 yield Answer:

Explanation / Answer

molarmass of phenylaceticacid (C6H5-CH2-COOH) = 12*8+2*16+1*8 = 136 g/mol

molarmass of dibenzyl ketone(C6H5-CH2-CO-CH2-C6H5) = 2*77+2*14+28 = 210 g/mol

no of mol of phenylaceticacid = 2.091/136 = 0.0154 mol

   no of mol of iron = 0.467/56 = 0.00834 mol

from equation, 1 mol phenylaceticacid = 1 mol iron = 1 mol dibenzyl ketone

   limiting reactant = iron

no of mol of dibenzyl ketone formed = 0.00834 mol

mass of dibenzyl ketone (theoretical yield) = 0.00834*210

                      = 1.7514 g

percent yield = practicalyield / theoretical yield*100

               = 1.243/1.7514*100

               = 70.97%

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