Chemistry

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Suppose a student started with 129mg transcinnamic acid and 0.50ml of 10% bromine solution and after the reaction and workup ended up with 0.216g of brominated product. Calculate the student's theoretical and percent yield.
My calculation
0.50ml x 10% = 5ml
And then 0.126g change 216mg

Who helps me to solve it for me. Step by step.

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