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Form each molecule of pyridinium tribromide will insituly generate one Br2 molecule: so each one trans cinnamic acid can be brominates with one molecule of Br2 generated by one molecule of pyridinium tribromide 1.18 equaivalent of (0.020 mol) pyridinium tribromide was used to react 1 equivalent of (0.017 mol) trans cinnamic acid so, trans cinnamic acid is limiting reactant, and if all react and give the bromoproduct, the obtained 2 3 - dibromohydrocinnamic acid (mol. Wt is 307) in grams (therotically consider 100% yield) 0.017 times 307 = 5.219 grams of dibromo compound will obtained dibromo compound in grams is 5.219
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